Add option to build rosettax87 locally (#9)

Reviewed-on: #9

README.md

@@ -16,7 +16,7 @@ A user-friendly launcher for Project Epoch on Apple Silicon Macs, with one-click
 
 ## Known Issues
 
-- For some users, it can take up to a minute for Wow to start after hitting the "Play" button. A fix is currently being worked on but will not be ready by launch
+- For some users, it can take up to a minute for Wow to start after hitting the "Play" button. A possible fix is described in the Troubleshooting section, please let @Battlehammer know on the Epoch discord if this works for you
  
 ## Usage
 
@@ -69,6 +69,17 @@ Make sure you login to Epoch with your username, not your email. Using your emai
 
 The initial patch download is quite large and can take a while if your internet is slow. The app will tell you when it's done.
 
+### After I click Play, the game takes a minute to load
+
+This appears to be a problem with using a built-in version of `rosettax87`. In order to fix this, you must compile it yourself.
+
+1. Install Xcode command line tools by opening a terminal and typing `xcode-select --install` and following the prompts
+2. Install Cmake
+  a. Setup [Homebrew](https://brew.sh/) if you don't have it already
+  b. Open a terminal and enter `brew install cmake`
+3. Run EpochSilicon and click the `Troubleshooting` button
+4. Find the line that says `Build Rosettax87 locally` and click the `Build` button, following the prompts 
+
 ### My resolution is super blown up and I can't see the whole screen
 
 Wine does that on first launch if you have a large widescreen monitor.