Add build instructions

README.md

@@ -7,3 +7,27 @@ A fully featured NBT Editor
 - NBT
 - SNBT
 - GUI
+
+## Build
+
+The following is the build instructions for this project.
+
+# Linux
+
+1. Install Flutter and add it to your path.
+2. Run the command: `flutter build linux`
+
+# Windows
+
+1. Install Flutter and add it to your path.
+2. Run the command: `flutter build windows`
+
+# MacOS
+
+1. Install Flutter and add it to your path.
+2. Install XCode
+3. Install any necessary command line developer tools from XCode
+4. Developer mode?
+5. Run the command? `flutter build mac` or `flutter build macos`
+
+**Testing needed** I do not own a Mac, testing by a Mac user will be required.