Update README.md

README.md

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 # orbit-db-powergate-io
 
 > A bridge between [OrbitDB](https://github.com/orbitdb/orbit-db) and [Powergate](https://docs.textile.io/powergate/), which is itself a bridge between [Filecoin](https://filecoin.io) and [IPFS](https://ipfs.io/).
+
+## Usage
+
+`orbit-db-powergate-io` uses dependency injection of both `orbitdb` and `pow` to work.
+
+For example to use it with a local devnet:
+
+```JavaScript
+const pow = createPow({ POWERGATE_URL }) // define this as you will
+const ipfs = new IpfsClient() // or await IPFS.create()
+orbitdb = await OrbitDB.createInstance(ipfs)
+powergateio = await PowergateIO.create(orbitdb, pow)
+```