PTM_U: Added a stub for GetBatteryLevel & GetBatteryChargeState & GetAdapterState 

Tested  on the 3ds homebrew luancher and is working exactly how it should be.
jeez, sorry, but the format is still not correct :D the `/** .. */` format is _specifically_ for docstrings, i.e. documentation that appears directly before a function, class, struct, etc. This is a format specified by DoxyGen (http://www.stack.nl/~dimitri/doxygen/), and is not to be used for inline commenting. You should instead do:
<pre>    // TODO(purpasmart96): This function is only a stub, it returns a valid result without
    // implementing full functionality.</pre>