Improve README

* Explain source code structure
* Add contributing info
* Link to license

README.md

@@ -1,7 +1,48 @@
 # Fullstack GraphQL
 
-Book about full stack GraphQL development with React and Node.
+An open source book about full stack GraphQL development with React and Node.
+
+<a href="https://graphql.college/fullstack-graphql">https://graphql.college/fullstack-graphql</a>.
 
 <a href="https://graphql.college/fullstack-graphql">
  <img src="manuscript/images/title_page.png" width="400px" alt="Cover" />
 </a>
+
+## Structure
+
+Each chapter is written in a markdown file in the `manuscript` folder.
+
+Every image in the book is located in `manuscript/images`.
+
+The order of the chapters is determined by the `Book.txt` file.
+
+`Sample.txt` defines the content of the book's sample chapter.
+
+## Contributing
+
+All types of contributions are welcome! Here is a little guide on how to contribute.
+
+### Bugs/Typos
+
+If you see a bug or typo please open a github issue.
+
+### Fixes
+
+To contribute with code fixes, please remix the example on Glitch and create a Pull Request referencing the fix's Glitch URL.
+
+### New chapters
+
+Please file an issue to suggest new chapters. Chapter suggestions are always welcome! But please don't create a PR with a new chapter before discussing about it, because it may not get accepted. Your time is golden, use it well!
+
+### Questions
+
+If you have any questions regarding the book, or GraphQL in general, please create a new conversation in https://spectrum.chat/graphql instead of a Github issue.
+
+## License
+
+![CC](https://creativecommons.org/images/deed/cc_blue_x2.png)
+![Attribution](https://creativecommons.org/images/deed/attribution_icon_blue_x2.png)
+![NC](https://creativecommons.org/images/deed/nc_blue_x2.png)
+![SA](https://creativecommons.org/images/deed/sa_blue_x2.png)
+
+This book is licensed under a [Creative Commons Attribution Non Commercial Share Alike 4.0 International](https://creativecommons.org/licenses/by-nc-sa/4.0/) license.