Adding more content to README

README.md

@@ -1,8 +1,16 @@
 # ZeroTier GitHub Action
 
-This Github Action connects to a [ZeroTier Network](https://www.zerotier.com).
+ZeroTier is an SDN platform that allows users to create virtual
+networks that can span multiple devices, locations, and cloud
+providers. ZeroTier creates an encrypted peer-to-peer mesh overlay
+network that handles NAT traversal, authentication, and authorization
+to network resources.
 
-```
+The ZeroTier Github Action allows users to easily integrate
+ZeroTier into their Github workflow by temporarily joining and
+authorizing workflow runner onto a private ZeroTier network.
+
+```yaml
 - name: ZeroTier
   uses: zerotier/github-action@v1
   with:
@@ -13,3 +21,30 @@ This Github Action connects to a [ZeroTier Network](https://www.zerotier.com).
 `ZEROTIER_CENTRAL_TOKEN` can be provisioned from `Account` section in the [ZeroTier Central](https://my.zerotier.com) admin panel.
 
 This Action works on Ubuntu, MacOS, and Windows runners.
+
+----
+
+This action installs ZeroTier on the runner node and generates a unique ZeroTier identity.  
+It then uses the supplied `auth_token` to authorize the runner onto the network.
+
+```yaml
+- name: ZeroTier
+  uses: zerotier/github-action@v1
+  with:
+    network_id: ${{ secrets.ZEROTIER_NETWORK_ID }}
+    auth_token: ${{ secrets.ZEROTIER_CENTRAL_TOKEN }}
+    
+- name: ping host
+  shell: bash
+  run: |
+    count=10
+    while ! ping -c 1 ${{ secrets.ZEROTIER_HOST_IP }} ; do
+      echo "waiting..." ;
+      sleep 1 ;
+      let count=count-1
+    done
+    echo "ping success"
+```
+
+After the workflow has completed, a `post` step automatically cleans
+up by removing the runner from the network.