update dev-plan with markdown format

README.md

@@ -357,11 +357,17 @@ http://mercurial.selenic.com/downloads
 
 step 3: download, compile, and install the project by executing the following command
 
+```bash
 go get github.com/chrislusf/seaweedfs/weed
+```
+
+once this is done, you should see the executable "weed" under `$GOPATH/bin`
 
-once this is done, you should see the executable "weed" under $GOPATH/bin
+step 4: after you modify your code locally, you could start a local build by calling `go install` under 
 
-step 4: after you modify your code locally, you could start a local build by calling "go install" under $GOPATH/src/github.com/chrislusf/seaweedfs/weed
+```
+$GOPATH/src/github.com/chrislusf/seaweedfs/weed
+```
 
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