readme: Added initial setup instructions

README.md

@@ -1,2 +1,22 @@
 # FireWallet
-Experimental wallet for Handshake chain
+Experimental wallet for Handshake chain
+
+## Installation
+### From Releases
+You can install the latest release from [here](https://github.com/Nathanwoodburn/FireWallet/releases/).
+### Build from source
+You can build from source by cloning this repo.  
+You will need Visual Studio (recommend a recent version) and .net desktop development tools installed.
+
+## Setup
+### Create a new wallet
+Not yet implemented
+
+## First time setup
+When you first open the wallet you will be prompted to set your node settings.
+
+You can get the API key from the HSD launch command or 
+in Bob wallet under settings > Wallet > API key.  
+If you change this key in HSD or Bob you will need to update it in FireWallet.  
+
+![Node settings](assets/node_settings.png)