🎨 - Update readme with clap output

Author: Roland Peelen

README.md

@@ -34,6 +34,51 @@ This project should be considered in beta status. We run it in production at [Wa
 
   Where `.` is the folder where the 'root' `bsconfig.json` lives. If you encounter a 'stale build error', either directly, or after a while, a `clean` may be needed to clean up some old compiler assets.
 
+## Full Options
+
+Find this output by running `yarn rewatch --help`.
+
+```
+Usage: rewatch [OPTIONS] [COMMAND] [FOLDER]
+
+Arguments:
+  [COMMAND]
+          Possible values:
+          - build: Build using Rewatch
+          - watch: Build, then start a watcher
+          - clean: Clean the build artifacts
+
+  [FOLDER]
+          The relative path to where the main bsconfig.json resides. IE - the root of your project
+
+Options:
+  -f, --filter <FILTER>
+          Filter allows for a regex to be supplied which will filter the files to be compiled. For instance, to filter out test files for compilation while doing feature work
+
+  -a, --after-build <AFTER_BUILD>
+          This allows one to pass an additional command to the watcher, which allows it to run when finished. For instance, to play a sound when done compiling, or to run a test suite. NOTE - You may need to add '--color=always' to your subcommand in case you want to output colour as well
+
+  -n, --no-timing <NO_TIMING>
+          [possible values: true, false]
+
+  -c, --create-sourcedirs <CREATE_SOURCEDIRS>
+          This creates a source_dirs.json file at the root of the monorepo, which is needed when you want to use Reanalyze
+          
+          [possible values: true, false]
+
+      --compiler-args <COMPILER_ARGS>
+          
+
+      --rescript-version <RESCRIPT_VERSION>
+          
+
+  -h, --help
+          Print help (see a summary with '-h')
+
+  -V, --version
+          Print version
+```
+
 # Contributing
 
   Pre-requisites: