Create CONTRIBUTING.md

CONTRIBUTING.md

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+# PiGallery2 Contribution guide (draft)
+
+## Intro
+
+This project reached to a point when I cannot maintain it alone. 
+I'm happy to see that some people already submitted some pull requests (PR) so everyone can benefit their changes.
+In general I'm happy to merge PRs, but I recommend to file a ticket and ask first if it is OK.
+
+
+
+## How to develop
+
+1. Download the sourcefiles
+2. install dependencies `npm install`
+3. Build client  `npm run run-dev`
+   * This will build the client with english localization and will keep building if you change the source files
+4. Build the backend `npm run build-backend`
+   * This runs `tsc` that transpiles `.ts` files to `.js` so node can run them. 
+     * To rebuild on change run `tsc -w`
+   * Note: you can skip this test if you use and IDE that supports typescript (e.g.: webstorm, vscode)
+5. Run the server `npm start`
+
+## Developer docs
+
+### Project structure
+Overview:
+```
+|-- benchmark --A benchmark tool to test the speed of the app (not needed for development)
+|-- demo -- contains some sample photo for https://pigallery2.herokuapp.com/  (not needed for development)
+|-- docker -- contains all docker and docker realted configurations (this is the recommended way for app deplyoment)
+|-- docs -- webpage for http://bpatrik.github.io/pigallery2/
+
+|-- src -- contains the rource files <-------- This is what you need
+|-- test -- contains the unit and integration tets <----- be nice and write tests to your feature
+```
+
+Source strucure:
+```
+|-- src -- contains the rource files <-------- This is what you need
+  |-- backend -- nodejs backend code
+  |-- common -- shared files (mostly DTOs) between the frontend and the backend
+  |-- frontend -- angular based frontend
+```
+TODO...