Added CONTRIBUTING

Author: eribertomota

CONTRIBUTING.md

@@ -0,0 +1,28 @@
+## HOW TO CONTRIBUTE TO CBM DEVELOPMENT
+
+CBM is available at https://github.com/resurrecting-open-source-projects/cbm
+
+If you are interested in contribute to CBM development, please, follow
+the following steps:
+
+1. Send a patch that fix an issue or that implement a new feature.
+   Alternatively, you can do a 'pull request'[1] in GitHub.
+
+   [1] https://help.github.com/articles/about-pull-requests
+
+2. Ask for join to the CBM project in GitHub, if you want to work
+   officially. Note that this second step is not compulsory. However,
+   to accept you in project, is needed a minimum previous collaboration.
+
+
+To find issues and bugs to fix, you can check these addresses:
+
+   - https://github.com/resurrecting-open-source-projects/cbm
+   - https://bugs.debian.org/cgi-bin/pkgreport.cgi?dist=unstable;package=cbm
+   - https://bugs.launchpad.net/ubuntu/+source/cbm/+bugs
+   - https://apps.fedoraproject.org/packages/cbm/bugs
+   - https://bugs.gentoo.org/buglist.cgi?quicksearch=cbm
+
+If you want to join, please make a contact.
+
+  -- Eriberto, Mon, 26 Apr 2021 16:08:53 -0300.