contributing file
ADD
CONTRIBUTING.md
+# How to submit a Pull Request to AFLplusplus
+
+Each modified source file, before merging, must be formatted.
+
+```
+make code-formatter
+```
+
+This should be fine if you modified one of the file already present in the
+project, otherwise run:
+
+```
+./.custom-format.py -i file-that-you-have-created.c
+```

contributing file