Add a README file

README.rst

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+Calendar.social
+===============
+
+Keep your calendar ond organise events in the Fediverse.
+
+How to contribute
+-----------------
+
+First, see our Code of Conduct.  That’s probably the most important part.
+
+We are more than interested in
+
+- Feature ideas.  The project is in its early phase, so every idea is welcome (even if it doesn’t
+  get into the first release.)
+- Bug reports.  Even though the project is in the early phase, we don’t want bugs to sneak in to
+  stay there forever.  Report everything you find.
+- Documentation.  Because well, obviously.
+- Fixes, features, actually implemented.
+  - Find your favourite issue/feature request
+  - Fork and clone the repository
+  - Create a branch for your work
+  - Code!
+  - Push to your branch
+  - Open a Pull Request
+  - Go through the review process with us
+  - Enjoy your work getting into the main tree
+
+FAQ
+---
+
+Why doing a federated calendar when you can send around vCard files via email?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Because this project is about much more than a plain calendar.  It’s also an event organiser,
+where you will be able to collaborate with others making events happen.
+
+Why is it not on GitHub/GitLab/any other popular hosting service?
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Because running my stuff is one of my hobby.  I run my own Matrix homeserver, my own Mastodon
+instance, why would my Git repositories be different?  It might change in the future, though; I’m
+not an enemy of said services and if this project turns out to be successful I might move it away
+from here.