Add draft social_media_post_tracker (#109)

The document is a simple logbook to track social media and website
posts. It should be improved later with some automatization
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**Relevant issues/PRs:**
Fixes #107 / For account access, see ACCOUNTS.md, and #98 / For
community manager
responsibilities, see GOVERNANCE.md and #78 
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social-media-management/social_media_post_tracker.md

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+
+# Fatiando a Terra Social Media Post Tracker
+
+- :hash: Slack
+- 🦣 Fosstodon https://fosstodon.org/@fatiando
+- :calendar: Calendar https://www.fatiando.org/calendar
+- :bird: Twitter https://twitter.com/fatiandoaterra
+- :briefcase: LinkedIn https://www.linkedin.com/company/fatiando
+- :octocat: Github  https://github.com/orgs/fatiando/discussions/categories/announcements
+- :globe_with_meridians: Website https://www.fatiando.org
+- :arrow_forward: Youtube https://www.youtube.com/@FatiandoATerra
+
+| Date       | Post          | :hash: | 🦣 | :calendar: | :bird: | :briefcase: | :octocat: | :globe_with_meridians: | :arrow_forward: |
+|------------|---------------|--------|----|------------|---------|-------------|------------|------------------------|------------------|
+| 2023-05-30 | BIRS workshop | ✅    | ❌ | ✅       | ✅    | ✅          | ❌       | ❌                     | NA               |
+
+
+# Templates
+
+## Weekly Fatiando Call
+Our weekly Fatiando Call starts in 1 hour! These are open to everyone who is interested in the project and wants to connect with us.
+:calling: Join here: https://meet.jit.si/fatiando-a-terra
+:memo: Meeting notes and agenda: https://hackmd.io/@fatiando/development-calls-2023
+
+
+# Resources
+
+- List of emojis: https://gist.github.com/rxaviers/7360908