Create angular/readme.md

Added a readme.md for angular implementations that links to community provided examples.

Signed-off-by: Luke Bermingham <1215582+lukehb@users.noreply.github.com>

Frontend/implementations/angular/readme.md

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+# Angular Implementations
+
+Here are a selection of community contributed implementations of Angular frontends.
+
+- [cheikhnadiouf](https://github.com/cheikhnadiouf)'s implementation - [LINK](https://github.com/cheikhnadiouf/PixelStreamingInfrastructure/tree/AngularImplementations/Frontend/implementations/angular)
+
+If you wish to contribute your own example frontend, please open an issue/PR.
+
+**Disclaimer: We do not warrant these for any fitness of purpose, nor do we maintain them.**