Update readme

README.md

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-# Tinfoil USB Installer
-Rewrite of the python Tinfoil USB installer script in golang: 
-[https://github.com/XorTroll/Tinfoil/blob/master/tools/usb_install_pc.py](https://github.com/XorTroll/Tinfoil/blob/master/tools/usb_install_pc.py)
+# TinfoilUSBGo
+TinfoilUSBGo is a Golang rewrite of the Python Tinfoil USB installer script: 
+[https://github.com/XorTroll/Tinfoil/blob/master/tools/usb_install_pc.py](https://github.com/XorTroll/Tinfoil/blob/master/tools/usb_install_pc.py).
+
+Tinfoil is a Nintendo Switch homebrew application used to manage titles. The
+existing Python 3 script was written to interface with Tinfoil's USB
+installation. This rewrite intends to eliminate the Python 3 dependency for
+those who do not wish to install it (mainly for Windows users).
+
+# Setup
+### Windows
+To interface with the Nintendo Switch, the libusbK driver is required.
+
+1. Download Zadig: [https://zadig.akeo.ie/](https://zadig.akeo.ie/).
+2. With your Nintendo Switch plugged in and on the Tinfoil USB install menu, choose
+"List All Devices" under the options menu in Zadig, and select libnx USB comms.
+3. Choose libusbK from the driver list and click the "Replace Driver" button.
+
+### macOS
+Under construction.
+
+### Linux
+Under construction.
+
+# Usage
+### Windows
+1. Plug in your Nintendo Switch and navigate to Tinfoil's USB install page.
+2. Open `cmd` or `PowerShell` and navigate to the downloaded `exe`.
+3. Run the application using `.\tinfoilusbgo-windows-10.0-amd64.exe [nsp_path]`.
+
+# Build
+TinfoilUSBGo uses [xgo](https://github.com/karalabe/xgo) to cross-compile to
+Windows and Linux. Xgo requires `docker` installed to build and run.
+
+### Windows
+```sh
+make build-windows
+```
+
+### macOS
+```sh
+make build-osx
+```
+
+### Linux
+Under construction.