Removed example files (can be recovered later)

Now it compiles with test main code

platformio.ini

@@ -17,3 +17,7 @@ lib_deps =
 	arduino-libraries/NTPClient@^3.2.1
 	knolleary/PubSubClient@^2.8
 	robtillaart/CRC@^1.0.3
+
+[env:native]
+platform = native
+test_framework = doctest