Initial pass on script Action

README.md

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+# script
+
+This action makes it easy to quickly write a script in your workflow that uses the GitHub API and the workflow execution context.
+
+See [octokit/rest.js](https://octokit.github.io/rest.js/) for the API client documentation.
+
+## Examples
+
+### Comment on an issue
+
+```yaml
+on:
+  issue: {type: opened}
+
+jobs:
+  comment:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/script@1.0.0
+        with:
+          github-token: ${{github.token}}
+          script: |
+            await github.issues.createComment({...context.issue, body: '👋 Thanks for reporting!'})
+```
+
+### Apply a label to an issue
+
+```yaml
+on:
+  issue: {type: opened}
+
+jobs:
+  apply-label:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/script@1.0.0
+        with:
+          github-token: ${{github.token}}
+          script: |
+            await github.issues.addLabels({...context.issue, labels: ['Triage']})
+```
+
+### Welcome a first-time contributor
+
+```yaml
+on: pull_request
+
+jobs:
+  welcome:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/script@1.0.0
+        with:
+          github-token: ${{github.token}}
+          script: |
+            // Get a list of all issues created by the PR opener
+            // See: https://octokit.github.io/rest.js/#pagination
+            const creator = context.payload.sender.login
+            const opts = github.issues.listForRepo.endpoint.merge({
+              ...context.issue,
+              creator,
+              state: 'all'
+            })
+            const issues = await github.paginate(opts)
+
+            for (const issue of issues) {
+              if (issue.number === context.issue.number) {
+                continue
+              }
+
+              if (issue.pull_request) {
+                return // Creator is already a contributor.
+              }
+            }
+
+            await github.issues.createComment({...context.issue, body: 'Welcome, new contributor!'})
+```