Added getting started instructions to readme, Update BUILDING_FROM_SOURCE

BUILDING_FROM_SOURCE.md

@@ -9,12 +9,17 @@ To see which version of LLVM you need, take a look at `Cargo.toml`, in particula
 
 For Ubuntu, I used the `Automatic installation script` at [apt.llvm.org](https://apt.llvm.org) - but there are plenty of alternative options at http://releases.llvm.org/download.html
 
-### Troubleshooting LLVM installation on Linux
+## Troubleshooting
+
+Create an issue if you run into problems not listed here.
+We intend to make contributing to Roc as smooth as possible.
+
+### LLVM installation on Linux
 
 On some Linux systems we've seen the error "failed to run custom build command for x11".
 On Ubuntu, running `sudo apt-get install cmake libx11-dev` fixed this.
 
-### Troubleshooting LLVM installation on Windows
+### LLVM installation on Windows
 
 Installing LLVM's prebuilt binaries doesn't seem to be enough for the `llvm-sys` crate that Roc depends on, so I had to build LLVM from source
 on Windows. After lots of help from [**@IanMacKenzie**](https://github.com/IanMacKenzie) (thank you, Ian!), here's what worked for me:

README.md

@@ -2,6 +2,16 @@
 
 Roc is a language for building reliable applications on top of fast platforms.
 
+## Getting started
+
+1. [Install rust](https://rustup.rs/)
+2. [Build from source](BUILDING_FROM_SOURCE.md)
+3. In the terminal execute from the root folder:
+    ```
+    cargo run repl
+    ```
+4. Check [these tests](https://github.com/rtfeldman/roc/blob/trunk/cli/tests/repl_eval.rs) for examples
+
 ## Applications and Platforms
 
 Applications are often built on a *framework.* Typically, both application and framework are written in the same language.