Add readme info

README.md

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-Hubs Backup Tool
+## Hubs Backup Tool
+
+This tool let you backup your assets from a Hubs instance (Demo Hub, Hubs Subscription Service or your own instance).
+
+You can get the binary version of the tool from the releases section. 
+
+### Running from the source
+- Clone this repository
+- Install the dependencies: `npm install`
+- Run it: `npm run start`
+
+### How to use this tool
+- Tool Overview: https://hubs.mozilla.com/labs/downloading-your-data
+- Written Docs: https://hubs.mozilla.com/docs/download-data.html
+- Youtube Video: TBD