Implement action

.github/workflows/main.yml

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+on: [push, pull_request]
+
+jobs:
+    build:
+        runs-on: ${{ matrix.os }}
+
+        strategy:
+            matrix:
+                wabt-version: ["1.0.20"]
+                os: [ubuntu-latest, macos-latest, windows-latest]
+
+        steps:
+
+        - uses: actions/checkout@v2
+
+        - name: Use wabt ${{ matrix.wabt-version }}
+          uses: ./
+          with:
+              wabt-version: ${{ matrix.wabt-version }}
+
+        - run: wat2wasm --help

.gitignore

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+/node_modules/

README.md

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+# setup-wabt-action
+
+This actions adds the [wabt](https://github.com/WebAssembly/wabt) binaries to PATH.
+
+## Usage
+
+```yaml
+- name: Use wabt ${{ matrix.wabt-version }}
+  uses: mwilliamson/setup-wabt-action@v1
+  with:
+    wabt-version: "1.0.20"
+```

action.yml

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+name: 'Set up wabt'
+description: 'Set up a specific version of wabt and add the command-line tools to the PATH'
+inputs:
+  wabt-version:
+    description: 'The wabt version'
+    required: true
+runs:
+  using: 'node12'
+  main: 'dist/index.js'