Merge pull request #853 from pastukhov/dev

Readme for u8glib app to dev

app/u8glib/README.md

@@ -0,0 +1,34 @@
+##U8glib package 
+
+Ported from https://github.com/olikraus/u8glib
+
+
+Here is black magic with ImageMagic package  for image conversion:
+
+
+
+```bash
+#!/bin/bash
+
+mkdir out
+
+for icon in *png; do
+    convert $icon -depth 1 ./out/$(basename $icon .png)_1bpp.png
+    if [[ "$icon" == *"black"* ]]; then
+        convert ./out/$(basename $icon .png)_1bpp.png -background white -alpha Background ./out/$(basename $icon .png)_1bpp.xbm
+    else
+        convert ./out/$(basename $icon .png)_1bpp.png -background black -alpha Background ./out/$(basename $icon .png)_1bpp.xbm
+    fi
+    cat ./out/$(basename $icon .png)_1bpp.xbm | tr '\n' ' '  | tr -d " " |sed  -e s'#^.*{##g'  | sed s'#,}##' |sed s'/;//' | xxd -r -p > ./out/$(basename $icon .png).xbm.mono
+done
+
+rm out/*png out/*xbm
+```
+Convert all the png in the current folder and put resulting .mono to ./out
+
+The convert binary  is a part of ImageMagic package. You need to install it.
+
+```
+sudo apt-get install imagemagick
+```
+for Debian/Ubuntu.