feat(challenge): create 3 new challengesinit

apps/rxjs-race-condition/README.md

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+<h1>RxJs race condition</h1>
+
+> Author: Thomas Laforge
+
+<!-- TODO: add Information/Statement/Rules/Constraint/Steps -->
+
+### Information
+
+### Statement
+
+### Step 1
+
+### Step 2
+
+### Constraints:
+
+### Submitting your work
+
+1. Fork the project
+2. clone it
+3. npm install
+4. **nx serve rxjs-race-condition**
+5. _...work on it_
+6. Commit your work
+7. Submit a PR with a title beginning with **Answer:12** that I will review and other dev can review.
+
+<!-- TODO: add challenge number and project Name -->
+
+<a href="https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A12+label%3Aanswer"><img src="https://img.shields.io/badge/-Solutions-green" alt="RxJs race condition"/></a>
+
+<!-- TODO: uncomment when done late -->
+<!-- <a href='https://github.com/tomalaforge/angular-challenges/pulls?q=label%3A12+label%3A"answer+author"'><img src="https://img.shields.io/badge/-Author solution-important" alt="RxJs race condition solution author"/></a>
+<a href="{Blog post url}" target="_blank" rel="noopener noreferrer"><img src="https://img.shields.io/badge/-Blog post explanation-blue" alt="RxJs race condition blog article"/></a> -->
+
+_You can ask any question on_ <a href="https://twitter.com/laforge_toma" target="_blank" rel="noopener noreferrer"><img src="./../../logo/twitter.svg" height=20px alt="twitter"/></a>