Update README instructions

README.md

@@ -2,19 +2,51 @@
 
 A utility for automatically typing text.
 
-### Building
+### Building the project
 
-```sh
+#### CLI only (Window and Linux)
+
+To build the CLI only you can just build the Rust portion of the project
+
+```shell
+cargo build --release
+```
+
+#### MacOS app
+
+For any API changes you need to re-generate the `cbinding/autotyper.h` header by doing
+
+```shell
 cd cbinding
 cargo install --force cbindgen
 cbindgen --config cbindgen.toml --crate cbinding --output autotyper.h
 cd ..
 cargo build --release
 ```
 
+Otherwise you can just build the static C library
+
+```shell
+cargo build --release
+```
+
+Then you can build the app by opening `auto-typer-macos` in XCode and following these steps
+
+1. `Product` -> `Archive`
+2. `Distribute App` -> `Copy App` -> `Next`
+3. Choose a directory to copy to
+4. Copy the app from the output directory to the `Applications` directory
+5. `System Settings` -> `Privacy and Security` -> `Accessibility` -> `+`
+6. Find the auto-typer app in `Applications`
+
+The application is then ready to use.
+
+_Note_ the application cannot be used properly in a debug build through XCode because you need accessibility permitted for the app. 
+You can use all features other than the keyboard shortcut.
+
 ### Testing the `cbinding` library
 
-```sh
+```shell
 cd cbinding
 cargo build --release --lib
 clang -framework CoreFoundation -framework CoreGraphics -L ../target/release -lautotyper test.c -o test.out