Add .github

.github/FUNDING.yml

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+custom: https://gitcoin.co/grants/79/lodestar-eth20-client

.github/workflows/test.yml

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+name: CI Tests
+
+on: [pull_request, push]
+
+jobs:
+  lint:
+    name: Quick tests
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Bootstrap
+      run: yarn
+    - name: Check types
+      run: yarn check-types
+    - name: Lint
+      run: yarn lint
+    - name: Tests
+      run: yarn test