Update README to contain doc about the remove command

#72

README.md

@@ -498,3 +498,15 @@ display.go
 Flags can be:
 
 - `--recursive,-r`: Recursively watch sub-directories as well.
+
+Removing Generated Mocks
+-----------------------------
+
+Sometimes it can be useful to systematically remove all mocks and matcher files generated by Pegomock. For this purpose, there is the `remove` command. By simply calling it from the current directory
+```
+pegomock remove
+```
+it will remove all Pegomock-generated files in the current directory. It supports additional flags, such as `--recursive` to recursively remove all Pegomock-generated files in sub-directories as well. To see all possible options, run:
+```
+pegomock remove --help
+```