Create README.md

Author: achimdoebler

README.md

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+# Introduction
+## What is µGUI?
+µGUI is a free and open source graphic library for embedded systems. It is platform-independent
+and can be easily ported to almost any microcontroller system. As long as the display is capable
+of showing graphics, µGUI is not restricted to a certain display technology. Therefore, display
+technologies such as LCD, TFT, E-Paper, LED or OLED are supported. The whole module
+consists of three files: **ugui.c**, **ugui.h** and **ugui_config.h**.
+
+## µGUI Features
+* µGUI supports any color, grayscale or monochrome display
+* µGUI supports any display resolution
+* µGUI supports multiple different displays
+* µGUI supports any touch screen technology (e.g. AR, PCAP)
+* µGUI supports windows and objects (e.g. button, textbox)
+* µGUI supports platform-specific hardware acceleration
+* 16 different fonts available
+* cyrillic fonts supported
+* TrueType font converter available ([https://github.com/AriZuu](https://github.com/AriZuu))
+* integrated and free scalable system console
+* basic geometric functions (e.g. line, circle, frame etc.)
+* can be easily ported to almost any microcontroller system
+* no risky dynamic memory allocation required
+
+## µGUI Requirements
+µGUI is platform-independent, so there is no need to use a certain embedded system. In order to
+use µGUI, only two requirements are necessary:
+* a C-function which is able to control pixels of the target display.
+* integer types for the target platform have to be adjusted in ugui_config.h.