Updates README with output from --help argument

README.md

@@ -10,7 +10,7 @@ and public headers.
     * `python3-venv`
 
 ## Setup
-1. Create a `python` virtual environment, install `conan`, and create a default profile:
+Create a `python` virtual environment, install `conan`, and create a default profile:
 ```bash
 python3 -m venv conan.venv
 source conan.venv/bin/activate
@@ -23,10 +23,22 @@ conan profile detect
     ```bash
     ./build.sh
     ```
-1.  The build command will generate a `deb` package in the `_packages` directory.  To install (to
+2.  The build command will generate a `deb` package in the `_packages` directory.  To install (to
     `/usr/local`) run:
     ```
     sudo dpkg -i _packages/_packages/cppchallenge_1.0.0_*.deb
     sudo ldconfig
     ```
     __TODO__: The `sudo ldconfig` step should be added to the `deb` package `postinst` step...
+3.  To run:
+    ```
+    $ cppchallenge
+    Hello World!
+    File name is: aname
+    $ cppchallenge --help
+    Just a simple 'hello'
+    Usage: cppchallenge [OPTIONS]
+
+    Options:
+      -h,--help                   Print this help message and exit
+    ```