Add Medplum to Software Development - FaaS

- [X] Submit one item per pull request. This eases reviewing and speeds up inclusion.
- [X] Format your submission as follows, where `Demo` and `Clients` are optional.
  Do not add a duplicate `Source code` link if it is the same as the main link.
  Keep the short description under 250 characters and use [sentence case](https://en.wikipedia.org/wiki/Letter_case#Sentence_case)
  for it, even if the project's webpage or readme uses another capitalisation
  such as title case, all caps, small caps or all lowercase.
  `Demo` links should only be used for interactive demos, i.e. not video demonstrations.
  ``- [Name](http://homepage/) - Short description, under 250 characters, sentence case. ([Demo](http://url.to/demo), [Source Code](http://url.of/source/code), [Clients](https://url.to/list/of/related/clients-or-apps)) `License` `Language` ``
- [X] Additions that depend on proprietary services outside the user's control must be marked `⚠`.
  ``- [Name](http://homepage/) `⚠` - Short description, under 250 characters, sentence case. ([Demo](http://url.to/demo), [Source Code](http://url.of/source/code), [Clients](https://url.to/list/of/related/clients-or-apps)) `License` `Language` ``
- [X] Additions that are not [Free software](https://en.wikipedia.org/wiki/Free_software) must be added to `non-free.md` and have the license set to `⊘ Proprietary`
- [X] Additions are inserted preserving alphabetical order.
- [X] Additions are not already listed at any of [awesome-sysadmin](https://github.com/n1trux/awesome-sysadmin), [awesome-analytics](https://github.com/onurakpolat/awesome-analytics), [staticgen.com](https://www.staticgen.com/), [staticsitegenerators.net](https://staticsitegenerators.net/).
- [X] The `Language` tag is the main **server-side** requirement for the software. Don't include frameworks or specific dialects.
- [X] Any license you add is in our [list of licenses](https://github.com/awesome-selfhosted/awesome-selfhosted/blob/master/README.md#list-of-licenses).
- [ ] You have searched the repository for any relevant [issues](https://github.com/awesome-selfhosted/awesome-selfhosted/issues) or [PRs](https://github.com/awesome-selfhosted/awesome-selfhosted/pulls), including closed ones.
- [X] Any category you are creating has the minimum requirement of 3 items.
  If not, your addition may be inserted into `Misc/Other`.
- [X] Any software project you are adding to the list is actively maintained.
- [X] The pull request title is informative, unlike "Update README.md".
  Suggested titles: "Add aaa to bbb" for adding software aaa to section bbb,
  "Remove aaa from bbb" for removing, "Fix license for aaa", etc.

README.md

@@ -1773,6 +1773,7 @@ Software for easy installation, management and configuration of self-hosted serv
 - [fx](https://github.com/metrue/fx) - A tool to help you do Function as a Service with painless on your own servers. `MIT` `Go`
 - [IronFunctions](https://github.com/iron-io/functions) - The serverless microservices platform by [iron.io](https://www.iron.io/). `Apache-2.0` `Go`
 - [LocalStack](https://localstack.cloud/) - LocalStack is a fully functional local AWS cloud stack. This includes Lambda for serverless computation. ([Source Code](https://github.com/localstack/localstack)) `Apache-2.0` `Python/Other`
+- [Medplum](https://www.medplum.com) - Firebase for healthcare apps - includes authentication, FHIR datastore, automations, interoperability engine and webhooks. ([Demo](https://foomedical.com/), [Source Code](https://github.com/medplum/medplum)) `Apache-2.0` `Typescript`
 - [Nhost](https://nhost.io/) - The Open Source Firebase Alternative with GraphQL. Get a database and backend configured and ready in minutes. ([Source Code](https://github.com/nhost/nhost)) `MIT` `Docker/Nodejs/Go`
 - [OpenFaaS](https://www.openfaas.com/) - Serverless Functions Made Simple for Docker & Kubernetes. ([Source Code](https://github.com/openfaas/faas)) `MIT` `Go`
 - [Trusted-CGI](https://github.com/reddec/trusted-cgi) - Lightweight self-hosted lambda/applications/cgi/serverless-functions platform. `MIT` `Go`