Added page about using fonts

Fonts.md

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+KOReader has some built-in fonts, and you can also install your own fonts.
+
+## Installing Fonts
+
+You *must* use [`.ttf`](https://en.wikipedia.org/wiki/TrueType) (TrueType Fonts). You cannot use `.woff`, `.woff2`, `.eot`, `.svg` or other font types.
+
+### Android
+On Android devices, copy the `.ttf` font file to:
+
+`/koreader/fonts/`
+
+You may need to create the `/fonts/` directory
+
+## Recommended fonts
+
+* [Chareink](https://www.mobileread.com/forums/showthread.php?t=184056) is a Serif font specifically designed for eInk devices.
+* [Fanwood](https://www.theleagueofmoveabletype.com/fanwood) is tailored to increase readability on eInk screens.
+* [Andika New Basic](https://software.sil.org/andika/download/) features clear, simply designed letters. Ideal for people learning to read.
+
+## Where to get more fonts
+
+* [FontSquirrel](https://www.fontsquirrel.com/)
+* [Google Fonts](https://fonts.google.com/)
+* [League of Moveable Type](https://www.theleagueofmoveabletype.com/)
+* [Font Library](https://fontlibrary.org/en)