Add changeset for publishing (#37)

.changeset/README.md

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+# Changesets
+
+Hello and welcome! This folder has been automatically generated by `@changesets/cli`, a build tool that works
+with multi-package repos, or single-package repos to help you version and publish your code. You can
+find the full documentation for it [in our repository](https://github.com/changesets/changesets)
+
+We have a quick list of common questions to get you started engaging with this project in
+[our documentation](https://github.com/changesets/changesets/blob/master/docs/common-questions.md)

.changeset/config.json

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+{
+  "$schema": "https://unpkg.com/@changesets/config@1.5.0/schema.json",
+  "changelog": [
+    "@changesets/changelog-github",
+    { "repo": "cloudfour/test-mule" }
+  ],
+  "commit": false,
+  "linked": [],
+  "access": "public",
+  "baseBranch": "main",
+  "updateInternalDependencies": "patch",
+  "ignore": []
+}

.changeset/selfish-dolphins-behave.md

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+---
+'test-mule': minor
+---
+
+First publish

.github/workflows/release.yml

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+name: Release
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    name: Release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Repo
+        uses: actions/checkout@v2
+        with:
+          # Fetch all git history for correct changelog commits
+          fetch-depth: 0
+
+      - name: Setup Node.js 14.x
+        uses: actions/setup-node@v2
+        with:
+          node-version: 14.x
+
+      - name: Install Dependencies
+        run: npm ci
+
+      - name: Create Release Pull Request or Publish to npm
+        uses: changesets/action@master
+        with:
+          publish: npm run release
+          version: npm run version
+          title: 'Publish Next Version'
+          commit: 'Publish Next Version'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}