requirements.txt added in gitignore

This is done to prevent accidentally adding requirements.txt to the commit, this is created by the odoo-provisioning in the same folder that we mounted the repo.

.gitignore

@@ -159,3 +159,5 @@ cython_debug/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+requirements.txt