added readme for o2 pro package

omega2pro/README.md

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+# Omega2 Pro Package
+
+The Omega2 Pro has 32MB of flash storage and 8 GB of eMMC Storage. 
+
+By default, the OpenWRT operating system will boot from the 32MB flash storage. The Omega2 Pro package has a script, `o2-pro-init`, that will *essentially* move operating system to the eMMC chip.
+
+This process is referred to as pivot overlay. It involves moving the writeable portion of the Omega’s firmware, the `overlay` partition, to the eMMC chip, with the read-only portion, the `rom` partition, remaining on the flash storage. 
+
+## The `o2-pro-init` Script
+
+The script will be installed at `/usr/bin/o2-pro-init` if the `omega2-pro-base` package is included/installed in the firmware. 
+**It will run automatically at boot.**
+
+In broad strokes, the script will do the following:
+
+1. Check if OS has booted from overlay partition on the eMMC chip. If so, the script will exit - pivot overlay has already been set up. If not the script will continue
+2. Format the eMMC chip and create the required partitions
+3. Duplicate the existing `overlay` partition from the flash to the eMMC storage
+4. Set configuration so `overlay` partition on the eMMC is automatically mounted
+5. *Unrelated to pivot overlay:* Set up a swap file on the eMMC to increase available memory
+6. Reboot the device
+
+After the script has run once, the Omega2 Pro will hold the write-able portion of the operating system on the eMMC - meaning that you will be able to use the full 8GB for storage!
+
+## More Information on Pivot Overlay
+
+For more information, see our [documentation article on Booting from External Storage](https://docs.onion.io/omega2-docs/boot-from-external-storage.html).
+
+## First Boot
+
+It’s expected behavior for firmware upgrades to take about 5 minutes and for the device to reboot twice during the process.
+
+The first reboot happens after the new firmware is installed. The second reboot is triggered by `o2-pro-init`, the initialization script that sets up the device so that the Operating System runs on the eMMC storage.