Add file with resources used by the Eiffel Community (#179)

RESOURCES.md

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+# Resources used by the Eiffel Community
+
+This file tracks the resources used by the Eiffel Community, including the main
+contact person. To suggest the Eiffel Community to use a new resource, you can
+contribute by adding the resource to this file through a Pull Request.
+
+## Various resources
+
+| Resource                                                                           | Main Contact                                                                                              |
+|------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------|
+| [GitHub](https://github.com/eiffel-community)                                      | [TC](https://github.com/eiffel-community/community/blob/master/GOVERNANCE.md#technical-committee-members) |
+| [Slack](https://eiffel-workspace.slack.com/)                                       | [Magnus Bäck](https://github.com/magnusbaeck)                                                             |
+| [YouTube](https://www.youtube.com/@EiffelCommunity)                                | [Emil Bäckmark](https://github.com/e-backmark-ericsson)                                                   |
+| [LinkedIn](https://www.linkedin.com/company/40197226)                              | [TC](https://github.com/eiffel-community/community/blob/master/GOVERNANCE.md#technical-committee-members) |
+| [HackMD](https://hackmd.io/team/eiffel-community?nav=overview)                     | [Emil Bäckmark](https://github.com/e-backmark-ericsson)                                                   |
+| [Travis CI](https://app.travis-ci.com/organizations/eiffel-community/repositories) | [TC](https://github.com/eiffel-community/community/blob/master/GOVERNANCE.md#technical-committee-members) |
+| [Codacy](https://app.codacy.com/)                                                  | ?                                                                                                         |
+| [Reviewable](https://reviewable.io/)                                               | ?                                                                                                         |
+
+## Google groups
+
+| Resource                                                                       | Main Contact                                                                                                   |
+|--------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------|
+| [eiffel-community](https://groups.google.com/g/eiffel-community)               | [TC](https://github.com/eiffel-community/community/blob/master/GOVERNANCE.md#technical-committee-members)      |
+| [eiffel-tc](https://groups.google.com/g/eiffel-tc)                             | [TC](https://github.com/eiffel-community/community/blob/master/GOVERNANCE.md#technical-committee-members)      |
+| [eiffel-community-security](mailto:[email protected]) | [Security Officers](https://github.com/eiffel-community/community/blob/master/GOVERNANCE.md#security-officers) |