Add some github stuff (PR templates, funding)

.github/FUNDING.yml

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+patreon: matrixdotorg
+liberapay: matrixdotorg

.github/PULL_REQUEST_TEMPLATE/ready-proposal.md

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+---
+name: Proposal ready for review
+about: A proposal that is ready for review by the core team and community.
+title: ''
+labels: proposal, proposal-in-review
+assignees: ''
+
+---
+
+<!-- Put your "rendered" link here -->
+
+### Pull Request Checklist
+
+<!-- Please read CONTRIBUTING.rst before submitting your pull request -->
+
+* [ ] Pull request includes a [changelog file](https://github.com/matrix-org/matrix-doc/blob/master/CONTRIBUTING.rst#adding-to-the-changelog)
+* [ ] Pull request includes a [sign off](https://github.com/matrix-org/matrix-doc/blob/master/CONTRIBUTING.rst#sign-off)
+* [ ] Pull request includes ['Rendered' link](https://matrix.org/docs/spec/proposals#process) above.
+* [ ] Pull request title and file name include this PR's number as the MSC number.

.github/PULL_REQUEST_TEMPLATE/spec-change.md

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+---
+name: Spec clarification/not a proposal
+about: A change that's not a spec proposal, such as a clarification to the spec itself.
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+### Pull Request Checklist
+
+<!-- Please read CONTRIBUTING.rst before submitting your pull request -->
+
+* [ ] Pull request includes a [changelog file](https://github.com/matrix-org/matrix-doc/blob/master/CONTRIBUTING.rst#adding-to-the-changelog)
+* [ ] Pull request includes a [sign off](https://github.com/matrix-org/matrix-doc/blob/master/CONTRIBUTING.rst#sign-off)
+* [ ] Pull request is classified as ['other changes'](https://github.com/matrix-org/matrix-doc/blob/master/CONTRIBUTING.rst#other-changes)

.github/PULL_REQUEST_TEMPLATE/wip-proposal.md

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+---
+name: WIP Proposal
+about: A proposal that isn't quite ready for formal review yet.
+title: '[WIP] Your Proposal Title'
+labels: proposal
+assignees: ''
+
+---
+
+<!-- Put your "rendered" link here -->
+
+### Pull Request Checklist
+
+<!-- Please read CONTRIBUTING.rst before submitting your pull request -->
+
+* [ ] Pull request includes a [changelog file](https://github.com/matrix-org/matrix-doc/blob/master/CONTRIBUTING.rst#adding-to-the-changelog)
+* [ ] Pull request includes a [sign off](https://github.com/matrix-org/matrix-doc/blob/master/CONTRIBUTING.rst#sign-off)
+* [ ] A ['Rendered' link](https://matrix.org/docs/spec/proposals#process) above.
+* [ ] Update the title and file name of your proposal to match this PR's number (after opening).
+* [ ] Ask in [#matrix-spec:matrix.org](https://matrix.to/#/#matrix-spec:matrix.org) to get this marked as ready for review, once it is ready for review.