Updates README with output from --help argument

README.md

@@ -1 +1,44 @@
-A basic C++ exercise.
+A basic C++ exercise which uses `conan` to satisfy dependencies before building a shared library and
+an executable that links it.  Also produces a `.deb` package which installs the executable, library,
+and public headers.
+
+## Prerequisites
+* Ubuntu 22.04 (or equivalent)
+* Additional required packages:
+    * `g++`
+    * `cmake`
+    * `python3-venv`
+
+## Setup
+Create a `python` virtual environment, install `conan`, and create a default profile:
+```bash
+python3 -m venv conan.venv
+source conan.venv/bin/activate
+pip install conan
+conan profile detect
+```
+
+## Building and running
+1.  To build, run:
+    ```bash
+    ./build.sh
+    ```
+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
+    ```