Create README.md

README.md

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 U8g2: Library for monochrome displays, version 2
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+U8g2 is a monochrome graphics library for embedded devices. U8g2 supports controller based (for example SSD1306) monochrome OLEDs and LCDs (See the U8g2/U8x8 setup guide for a complete list of supported display controller). 
+The Arduino library U8g2 can be installed from the library manager of the Arduino IDE. U8g2 also includes U8x8 library:
+ * U8g2
+   * Includes all graphics procedures (line/box/circle draw).
+   * Supports many fonts. (Almost) no restriction on the font height.
+   * Requires some memory in the microcontroller to render the display.
+ * U8x8
+   * Text output only (character) device.
+   * Only fonts allowed with fixed size per character (8x8 pixel).
+   * Writes directly to the display. No buffer in the microcontroller required.
+