Add readme with pin infos and image of the finished board

README.md

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+# Mikro-SD Breakout-Platine
+
+![Image of finished breakout board](images/finished-board.jpg)
+
+## Pinlayout
+
+```text
+              ____________
+             |            |
+        +----|            |----+
+        |    |            |    |
+   DAT2 | *  _\           |  * | DAT1
+        |    |            |    |
+CD/DAT3 | *  \            |  * | DAT0
+        |     |           |    |
+    CMD | *   |           |  * | GND
+        |     |           |    |
+    VCC | *   \___________/  * | CLK
+        |                      |
+        +----------------------+
+```
+
+`VCC` sollte 3,3 V betragen.
+
+## SPI-Anschluss
+
+| SD     | SPI             | ML507 J6-Pin |
+| ------ | --------------- | ------------ |
+| `CLK`  | `SCLK`          | 2            |
+| `CMD`  | `MOSI`          | 4            |
+| `DAT3` | `CS`            | 6            |
+| `DAT2` | nicht verwendet |              |
+| `DAT1` | nicht verwendet |              |
+| `DAT0` | `MISO`          | 12           |
+
+## Licence
+
+This project by Klemens Schölhorn is licensed under the terms of the GPLv3.