doc: Added READMEs for TACOS usage

include/sta/tacos/README.md

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+# TACOS tasks and prototypes
+
+## Statemachine
+The statemachine is the core of TACOS. It is responsible for managing the state of the system and executing the threads that are registered to it. The statemachine is a singleton and can be accessed via `sta::tacos::Statemachine::instance()`. 
+
+For further info check the file or the doxygen documentation.
+
+## Watchdog
+The watchdog checks if all threads are setting a flag after every func call. If a thread does not set the flag in the given interval the thread is restarted.
+
+The watchdog is enabled and configured with the following defines:
+```cpp
+#define STA_RTOS_WATCHDOG_ENABLE
+#define STA_TACOS_WATCHDOG_FREQUENCY 10000
+```
+
+## CAN Bus
+The CAN bus is used to communicate between different devices. The CAN bus task is triggered by IRQ from the transceiver or if something is inserted into it's output queue.
+
+This thing is a huge steaming (but functioning) pile of shit. Further documentation is on hold until rework.
+
+## Thread.hpp
+Here the TacosThread is defined. Very straight forward. Just take a look inside.

include/sta/tacos/c_api/README.md

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+# TACOS C API
+
+Currently the only C API is the entry point for starting up TACOS. This will be extended to provide full functionality via C calling conventions.