Add .github folder

.github/FUNDING.yml

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+custom: [
+  'https://getalby.com/p/yuki',
+]

.github/dependabot.yml

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+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "monthly"

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  fmt:
+    name: Format
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Justfile
+        run: cargo install just
+      - name: Check
+        run: just check-fmt
+
+  check-crates:
+    name: Check crates
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Cache
+      uses: actions/cache@v3
+      with:
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-default-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+    - name: Justfile
+      run: cargo install just
+    - name: Check
+      run: just check-crates
+
+  check-crates-msrv:
+    name: Check crates (MSRV)
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+    - name: Cache
+      uses: actions/cache@v3
+      with:
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-msrv-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+    - name: Justfile
+      run: cargo install just
+    - name: Check
+      run: just check-crates-msrv
+
+  check-docs:
+    name: Check docs
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Cache
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-doc-${{ hashFiles('**/Cargo.toml','**/Cargo.lock') }}
+      - name: Justfile
+        run: cargo install just
+      - name: Check
+        run: just check-docs