Update README.md

README.md

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 # dotnet-arm
-Automated builds of .NET Core for ARM
+## Automated builds of .NET Core for Ubuntu 16.04 on ARM
+
+### Running
+
+1. See [here](https://github.com/dotnet/core/blob/master/samples/RaspberryPiInstructions.md) for prerequisites (for all ARM, not just Raspberry Pi)
+2. Head over to the [Releases](https://github.com/stevedesmond-ca/dotnet-arm/releases) and follow instructions there
+
+### Building
+
+1. create an x64 Ubuntu 16.04 VM that has your GitHub SSH key
+2. clone this repo (`git clone git@github.com:stevedesmond-ca/dotnet-arm`) otherwise obtain the code
+3. `cd dotnet-arm` or wherever you put it
+4. `./setup` will run everything to configure your environment for building
+  - installing prerequisites
+  - checking out all components
+  - setting up the chroot for cross-compiling
+5. `./build` will kick off the build of all components, or you can build them individually
+  - `./build-libuv`
+  - `./build-coreclr`
+  - `./build-corefx`
+  - `./build-corehost`
+6. `./test` will take the output of the build and test it in the chroot created during setup
+  - if you see `Hello World!`, your build was successful!
+7. `./reset` will clean build artifacts and other intermediate/temporary files to prep for the next build
+8. `./update` will update all the repos to the latest commit on master