improve readme files

apps/projection/README.md

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+<h1>Projection</h1>
+
+### Statement
+
+Refactor this working exemple of a dasboard containing multiple cards (teachers, students, ...)
+Implement the City card.
+
+### Constraints:
+
+- You **must** keep **CardComponent** and **ListItemComponent**
+- **NgFor** directive must be declare and stay inside **CardComponent**
+- No **NgIf** or **NgSwitch** inside **CardComponent**
+- CSS: prefer not to use **::ng-deep**, find a better way
+
+### Submitting your work
+
+1. Fork the project
+2. clone it
+3. npm install
+4. **nx serve projection**
+5. _...work on it_
+6. Commit your work
+7. Submit a PR that I will review and other dev can review.
+
+<a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A1+label%3Aanswer" target="_blank"><img src="https://img.shields.io/badge/-Solutions-green" alt="Projection"/></a>
+
+_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank"><img src="./../../logo/twitter.svg" height=20px alt="Projection"/></a>