Add an initial CONTRIBUTING file.

Add a standard CONTRIBUTING file which describes how you can contribute
to Wireshark. Make it Markdown with a .md extension since that's the
default in the GitLab UI and elsewhere.

1 files changed, 3 insertions, 0 deletions

diff --git a/tools/checklicenses.py b/tools/checklicenses.py
index 9e950c87f0..5a8dda2ba0 100755
--- a/tools/checklicenses.py
+++ b/tools/checklicenses.py
@@ -70,6 +70,9 @@ PATH_SPECIFIC_ALLOWED_LICENSES = {
     'wimaxasncp/dictionary.dtd': [
         'UNKNOWN',
     ],
+    'CONTRIBUTING.md': [
+        'UNKNOWN',
+    ],
     'doc/': [
         'UNKNOWN',
     ],