feat: init README

README.md

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+# Mystiq Meta Repository
+
+## To claim expenses
+
+1. [Create new issue](https://git.batsense.net/mystiq/org/issues/new)
+2. Add `expense` label
+3. Add suitable title, description, and attach invoices if any.
+4. Assign to self
+5. Close
+
+To dispute claimed expenses, comment on the issue. Expenses that are are
+not disputed within 30 days are considered approved by the core team and
+will be reimbursed when the organisation is profitable.