Added BMFont Settings documentation

resources/font/BMFont_settings.txt

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+Changing a character:
+1. open "PixelMplus10-Regular.sfd" in FontForge
+2. edit the chars to your liking
+3. Create .ttf file
+4. install created .ttf file
+5. open BMFont
+6. set the settings / enable new characters
+7. Export as .fnt file
+
+-----Font Settings:
+Font: PixelMplus10
+Charset: unicode
+Size: 10px
+Height: 100%
+Match char height: ON
+Outline thickness: 1
+Everything else: OFF
+
+-----Export Options:
+Spacing: A= 1 ; B = 1
+Equalize the cell heights: ON
+Width: 1024
+Height: 1024
+Bit depth: 32
+Chnl A: Outline
+Chnl RGB: Glyph
+Font descriptor: Binary
+Compression: Deflate