Make node-version input optional, update README

Author: adamhamlin

README.md

@@ -1,2 +1,29 @@
-# (WIP) checkout-node-project
-A custom GitHub Action to checkout and initialize a Node project
+# `checkout-node-project`
+
+A simple composite GitHub Action to checkout and initialize a Node project.
+
+## Usage
+
+Remove boilerplate to initialize your node project, so you can replace...
+
+```yaml
+steps:
+  - name: Checkout your branch
+    uses: actions/checkout@v3
+
+  - name: Then install Node.js
+    uses: actions/setup-node@v3
+    with:
+      node-version: 16.x
+
+  - name: Then install dependencies
+    run: npm ci
+```
+with...
+```yaml
+steps:
+  - name: All above steps in one!
+    uses: adamhamlin/[email protected]
+    with:
+      node-version: 16.x
+```

action.yaml

@@ -1,10 +1,10 @@
 name: 'Checkout Node Project'
-description: 'Checkout branch, install Node, and run `npm ci`'
+description: 'Checkout, install Node, and run `npm ci`'
 
 inputs:
   node-version:
-    description: Nodejs version to install
-    required: true
+    description: Node.js version to install
+    required: false
     default: 16.x
 
 runs: