Add mathematical keyboard layout

[Kuna42]

Create a new keyboard layout for typing mathematical symbols.

The Keys are currently not sorted by frequency of use.
Those are sorted by similarity. ( As much as possible )
I would first try this layout out, so can you please mark it as an experimental layout?

[sslater11]

When I saw this, I thought it was a calculator built into the keyboard and thought that was a great idea haha.

[dessalines]

Interesting!

This is unused, you need to add it to the keyboard_definitions file too. Check the recent PRs.

And make sure you run ./gradlew formatKotlin to pass lint.

[dessalines]

Thx!

[Kuna42]

I tried to press all keys. But this characters appeared.

@dessalines what could be wrong?

[dessalines]

I don't know what this character appeared means, but as you made this keyboard, I can't help you with it.

[sslater11]

I saw this and wasn't sure what you meant either 😅.
Could you please explain the issue fully?

[Kuna42]

Sorry for this bad explanation of my problem.
Later when i have more time left, i try to get a better description of my problem.

[Kuna42]

Now, the problem should be fixed.
I didn't read the file correctly.
This Pull Request has know the things i missed the first time.