Create autofocus.md

Added Autofocus authentication docs

docs/autofocus.md

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+# AutoFocus
+
+## Use the following procedure to get your API key.
+
+### Step 1: Log in to the Customer Support Portal and add your authorization code.
+- Visit https://support.paloaltonetworks.com.
+- Select the AssetsSite > Licenses tab.
+- Select Add Site License.
+- Enter the authorization code.
+
+### Step 2: Activate the API.
+- Select the Enable action in Site Licenses.
+- Select the API Key link.
+
+### The API key appears onscreen as shown below. Use this API key for all AutoFocus API requests.
+
+![image](https://github.com/Shuffle/openapi-apps/assets/31187099/d3e5d3bf-7956-47af-9ab6-f13b90445363)
+
+After you Get Your API Key, use that API key to make your first calls to the AutoFocus API.