Add postman collection, and update IP to localhost (#189)

rest-api-postman-collection/readme.md

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+# Vision AI DevKit Postman Collection
+
+This Postman collection export exists to faciliate changing properties, running commands, and getting information via REST calls supported by the Vision AI Camera.
+
+To set up:
+
+1. Import the provided collection into Postman (version 7.2.2 or higher).
+1. Open the **Manage Environments** dialog (gear icon in upper, right-hand corner).
+    1. **Add** a new environment.
+    1. Name the environment.
+    1. Add a variable named hostIp.
+    1. Add a variable named sessionId.
+    1. Press the **Add** button to save.
+
+To use:
+
+1. Determine the IP address of the camera.
+    - Using an SSH connection, type `ifconfig wlan0`.
+1. Select the environment you created earlier for this camera using the upper, right-hand corner dropdown box.
+1. Select the **Environment quick look** button (eye icon in upper, right-hand corner).
+1. Edit the current value of the hostIp variable, and type in the camera IP address obtained in step 1.
+1. Open the Login request, and press the Send button.
+1. In the response pane, press the Headers tab.
+1. Find the **Set-Cookie** header, and copy the text after "session=".
+1. Back in the **Environment quick look** dialog, set the current value for the sessionId variable to the value copied.
+1. Run any of the other request. If any of the requests get an unauthorized error, re-run the Login request, copy the session Id, and update it in the Environment quick look dialog.