Added expert-review-tips.md and known-issues.md

docs/documentation/known-issues.md

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+
+
+## Android Studio gradle could not sync with project (MacOS)
+
+A solution to this issue is by removing the cache files in the gradle folder.
+This can be done by executing the following command:
+
+```bash
+sudo rm -rf ~/.gradle/caches/
+```
+
+If the issue presists, one can remove the existing gradle executables in the 
+following path:
+
+> `/Users/.../.gradle/wrapper/dists/`
+
+If the issue still remains, one can try removing the gradle files in the project
+and try to sync the project again. This can be done by removing the gradle files in
+the project source directory and then syncing the project again.

docs/personalDocs/Luca/expert-review-tips.md

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+
+## Expert review #1
+
+### Document as you go
+Documenteer alle problemen die voorkomen bij het project en noteer de
+oplossingen voor deze problemen. Dit kan bijvoorbeeld d.m.v. een command die
+cache files verwijderd, of op welke manier je een project fixt. Dit kan toekomstige
+problemen voorkomen.
+