Add build instructions to readme

README.md

@@ -4,4 +4,46 @@
 [![Codecov](https://img.shields.io/codecov/c/github/velopack/velopack?style=flat-square)](https://app.codecov.io/gh/velopack/velopack)
 [![License](https://img.shields.io/github/license/velopack/velopack?style=flat-square)](https://github.com/velopack/velopack/blob/develop/LICENSE)
 
-# Velopack
+# Velopack
+
+# Compiling
+
+Velopack is made up of some Rust binaries which are re-distributed with installed apps, a .NET NuGet package, and a .NET command line tool. In order to test the project, you need to build the Rust binaries before compiling dotnet.   
+
+### Prerequisites
+ - [.NET 6 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/6.0)
+ - [.NET 8 SDK](https://dotnet.microsoft.com/en-us/download/dotnet/8.0)
+ - [Rust / Cargo](https://www.rust-lang.org/tools/install)
+ - `dotnet tool install -g dotnet-coverage`
+ - `dotnet tool install -g nbgv`
+
+### Debug / Test
+On windows, you need to build the Rust binaries using the `windows` feature before running tests. On OSX, you should run `cargo build` instead. 
+
+```shell
+git clone https://github.com/velopack/velopack.git
+cd velopack/src/Rust
+cargo build --features windows
+cd ../../
+dotnet build
+dotnet test --no-build
+```
+
+### Release / Build
+This is slightly complicated, because you will need to compile Rust on x64 OSX and x64 Windows before creating the final packages.
+
+On OSX:
+```shell
+git clone https://github.com/velopack/velopack.git
+cd velopack/src/Rust
+cargo build --release
+```
+
+On Windows:
+```shell
+git clone https://github.com/velopack/velopack.git
+cd velopack/src/Rust
+cargo build --release --features windows
+copy {path_to_osx_update} target/release/updatemac
+dotnet build -c Release /p:PackRustAssets=true
+```