Add README.md porting content from wiki

Author: jdswinbank

finance/README.md

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+# Finance Committee
+
+The Finance Committee was convened in an interim basis in December 2019.
+Its status was confirmed and the “interim” designation removed following the CoCo3 election in September 2021.
+
+## Charge
+
+Committee members are charged with filling the role [described on the Astropy website](https://www.astropy.org/team.html#role-responsibilities).
+
+## Membership
+
+Current members are [listed on astropy.org](https://www.astropy.org/team.html#finance_committee_member).
+
+### Alumni
+
+- Steve Crawford (Ombudsperson; @crawfordsm)
+- Hans Moritz Günther (@hamogu)
+
+## Communications
+
+### Committee Business
+
+The running notes of the committee are public and open for comment.
+Notes are available covering various periods:
+
+- [December 2019 through April 2021](https://docs.google.com/document/d/193ERJ6wMNPaNjGSWbS94KHGnojpZ_zwXxWTi9L2etSo/edit#heading=h.w71o1ycqjoz);
+- [April 2021 onwards](https://docs.google.com/document/d/1OpSEtJC0jQINTB-YNexxgnHX7-J6HRSkiPKYWBSCOfg/edit?usp=sharing).
+
+The committee uses the public [#finance-committee](https://astropy.slack.com/archives/CRE40TXTK) channel on Slack and the issue tracker in the [astropy-project repo](https://github.com/astropy/astropy-project/issues) to track its activities.
+
+### Feedback
+
+We welcome feedback, questions, and comments on this committee's activities via any of the following methods:
+
+- Comment on the running notes linked above.
+- Message in [#finance-committee](https://astropy.slack.com/archives/CRE40TXTK) on Slack.
+- Email to [email protected].
+- Make an issue in the [astropy-project repo](https://github.com/astropy/astropy-project/issues).
+
+## Policies
+
+The committee conducts its business according to a set of agreed [Policies](https://github.com/astropy/project/blob/master/finance/finance-ctte-policy.rst).
+Suggestions of changes to these policies are welcome; please use the communication channels described above.