Correct action description

The description was written before the action became a general purpose tool for compilation testing of Arduino sketches.

Author: per1234

README.md

@@ -1,6 +1,6 @@
 # libraries/compile-examples action
 
-This action compiles all of the examples contained in the library.
+This action checks whether Arduino sketches compile and produces a report of data from the compilations.
 
 ## Inputs