add Makefile with tests and helpers, update/simplify #Contributing

* make noexternallink: chekc for Lines with no source/demo/other link
 * make missinglicenselanguage: check Lines with only 1 or no language/license entry
 * make contrib: print list of contributors
 * make add: helper to add a new software entry
 * add TODOs
 * remove link to form since it is unmaintained and outputs wrongly formatted entries https://github.com/Kickball/awesome-selfhosted/issues/282#issuecomment-185423033
 * add BEGIN/END SOFTWARE LIST markers to restrict processing to software list only (HTML comments, not rendered to markdown)
 * link to README.md editor, issues, pull requests
 * Requirements for Makefile: make, bash. Available in Linux distribution repositories, in XCode on Mac, in GOW on Windows.
 * Fixes #461

Makefile

@@ -0,0 +1,45 @@
+#!/usr/bin/make -f
+SHELL = /bin/bash
+all: checks
+
+checks: missinglicenselanguage
+
+noexternallink:
+	@echo "Lines with no source/demo/other link:"
+	@sed -n -e '/BEGIN SOFTWARE LIST/,/END SOFTWARE LIST/ p' README.md | egrep '^ *\* ' | egrep --color=always '[a-z\.] `'
+
+missinglicenselanguage:
+	@echo "Lines with only 1 or no language/license entry:"
+	@sed -n -e '/BEGIN SOFTWARE LIST/,/END SOFTWARE LIST/ p' README.md | egrep '^ *\* ' | egrep -v '` `'
+
+contrib:
+	@git shortlog -sne
+
+add:
+	@#add a new entry
+	@printf 'Software name: ' ;\
+	read Name; if [ -z "$$Name" ]; then printf 'Missing software name!\n'; exit 1 ; fi ;\
+	printf 'Homepage URL: ' ;\
+	read Url; if [ -z "$$Url" ]; then printf 'Missing main project URL!\n'; exit 1 ; fi ;\
+	printf 'Description (max 250 char): ' ;\
+	read Description; if [ -z "$$Description" ]; then printf 'Missing description!\n'; exit 1 ; fi ;\
+	printf 'License: ' ;\
+	read License; if [ -z "$$License" ]; then printf 'Missing license!\n'; exit 1 ; fi ;\
+	printf 'Main server-side language/platform/requirement: ' ;\
+	read Language; if [ -z "$$Language" ]; then printf 'Missing language!\n'; exit 1 ; fi ;\
+	printf 'Demo URL (if any): ' ;\
+	read Demo; if [ -z "$$Demo" ]; then CDemo="" ; else CDemo="[Demo]($$Demo)" ; fi ;\
+	printf 'Source code URL (if different from Homepage): ' ;\
+	read Source; if [ -z "$$Source" ]; then CSource="" ; else CSource="[Source Code]($$Source)" ; fi ;\
+	if [[ "$$CSource" == "" && "$$Demo" == "" ]]; \
+	then Moreinfo="";\ printf "debug" ;\
+	else Moreinfo=$$(echo "($$CSource$$CDemo)" | sed 's|)\[|\], [|g') ;\
+	fi ;\
+	echo -e "Copy this entry to your clipboard, paste it in the appropriate category:\n\n" ;\
+	echo " * [$$Name]($$Url) - $${Description}. $$Moreinfo \`$$License\` \`$$Language\`"
+
+
+#TODO ask for category and insert item accordingly
+#TODO check for unsorted entries
+#TODO automatically sort entries/sections
+#TODO autoupdate contributors list

README.md

@@ -6,6 +6,8 @@ Selfhosting is the process of locally hosting and managing applications instead
 
 This is a list of [Free](https://en.wikipedia.org/wiki/Free_software) Software [network services](https://en.wikipedia.org/wiki/Network_service) and [web applications](https://en.wikipedia.org/wiki/Web_application) which can be hosted locally. Non-Free software is listed on the [Non-Free](non-free.md) page.
 
+See [Contributing](#contributing).
+
 Table of Contents
 =================
 
@@ -82,6 +84,8 @@ Table of Contents
 
 -----------------------------------------------------------------------------
 
+<!-- BEGIN SOFTWARE LIST -->
+
 ## Analytics
 
 _Web Analytics_
@@ -849,7 +853,7 @@ See also [Documentation Generators](#documentation-generators), [Wikimatrix](htt
   * [UBOS](http://ubos.net/) - Linux distro that runs on indie boxes (personal servers and IoT devices). Single-command installation and management of apps - Jenkins, Mediawiki, Owncloud, Wordpress, etc., - and other [features](http://ubos.net/about/).`GPLv3` `Perl/Other` 
   * [yunohost](https://yunohost.org/) - A server operating system aiming to make self-hosting accessible to everyone. ([Source Code](https://github.com/YunoHost)) `AGPL` `Python/Other`
 
-
+<!-- END SOFTWARE LIST -->
 
 -------------------------------------------------------
 
@@ -891,14 +895,12 @@ See also [Documentation Generators](#documentation-generators), [Wikimatrix](htt
 
 ## Contributing
 
- * You can help by sending Pull Requests to add more services. See [Editing files](https://help.github.com/articles/editing-files-in-another-user-s-repository/), [Creating Pull Requests](https://help.github.com/articles/creating-a-pull-request/), [Using Pull Requests](https://help.github.com/articles/using-pull-requests/)
+ * To **add an entry**: clone/[download](https://github.com/Kickball/awesome-selfhosted/archive/master.zip) and enter the repository, run `make add` and follow the instructions; or [edit the README.md file](https://github.com/Kickball/awesome-selfhosted/edit/master/README.md) directly. See [Editing files in another user's repository](https://help.github.com/articles/editing-files-in-another-user-s-repository/), [Creating Pull Requests](https://help.github.com/articles/creating-a-pull-request/), [Using Pull Requests](https://help.github.com/articles/using-pull-requests/) for help on sending your patch.
+ * The **syntax** for links is ``[Name](http://homepage/) - Short description. ([Demo](http://url.to/demo), [Source Code](http://url.of/source/code)) `License` `Language` ``. All projects should have their **license** and main server-side **language**/platform/requirement listed, and a description at most 250 characters long.
  * Non-[Free](https://en.wikipedia.org/wiki/Free_software) software must be marked `⊘ Proprietary` next to the title, and added to [non-free.md](non-free.md)
- * [This form](https://joubertredrat.github.io/awesome-selfhosted-form/) will help you formatting your new software entry. The syntax for links is ``[Name](http://homepage/) - Short description. ([Demo](http://url.to/demo), [Source Code](http://url.of/source/code)) `License` `Language` ``
- * All projects should have their license and main programming language/platform referenced.
- * Please limit the short description of the project to **250 characters**.
  * Software with no development activity for 6-12 months may be removed from the list.
- * Sections should be ordered alphabetically, lines inside sections should be ordered alphabetically.
- * The list of contributors can be updated with `git shortlog -sne`
+ * Check current [issues](https://github.com/Kickball/awesome-selfhosted/issues) and [Pull Requests](https://github.com/Kickball/awesome-selfhosted/pulls), as well as [closed issues/PRs](https://github.com/Kickball/awesome-selfhosted/pulls?utf8=%E2%9C%93&q=is%3Aclosed+)
+ * The list of contributors can be updated with `make contrib`. Several checks are available: `make noexternallink; make missinglicenselanguage`
 
 
 ## License