Games/mitzi-hirn added. It is a new F0-boardgame app similar to Mastermind.

[fgreil]

Application Submission

• A new game app: Hirn (German for "brain") is a one-player logic game where Flipper Zero creates a secret color code with 4 sybmols of 6 different colors. The user has to guess it in the fewest attempts while receiving clues: Black pegs for correct color/position, grey/dotted pegs for correct color/wrong position.

Extra Requirements

• No extras required

Author Checklist (Fill this out)

• I've read the contribution guidelines and my PR follows them
• I own the code I'm submitting or have code owner's permission to submit it
• I have validated the manifest file(s) with python3 tools/bundle.py --nolint applications/CATEGORY/APPID/manifest.yml bundle.zip

Reviewer Checklist (Don't fill this out)

• Bundle is valid
• There are no obvious issues with the source code
• I've ran this application and verified its functionality