Finished i2c implementation

README.md

@@ -70,10 +70,9 @@ The PWM mode of the hardware timer can also be used. Additionally, if PWM is nee
     - [ ] Provide an example showcasing the usage and possibilities
 - I2C
     - [x] Separation of interface and backend-driver
-    - [ ] Support all hardware provided configuration options
-    - [ ] Compile-time check for correct hardware configuration
-    - [ ] Software backend driver
-    - [ ] Provide an example showcasing the usage and possibilities
+    - [x] Support common usage with easy extendability
+    - [x] Compile-time check for correct hardware configuration
+    - [x] Provide an example showcasing the usage and possibilities
 - Timers
     - [ ] Support all hardware provided configuration options
     - PWM