Add instructions for using this template

Author: ChrisThrasher

README.md

@@ -8,9 +8,31 @@ The template starts out very basic, but might receive additional features over t
 - Basic CMake script to build your project and link SFML
 - Basic [GitHub Actions](https://github.com/features/actions) script for all major platforms
 
-## License
-
-The source code is dual licensed under Public Domain and MIT -- choose whichever you prefer.
+## How to Use
+
+1. Follow the above instructions about how to use GitHub's project template feature to create your own project.
+1. Open [CMakeLists.txt](CMakeLists.txt). Rename the project and the executable to whatever name you want. The project and executable names don't have to match.
+1. Install SFML 2.5.1.
+
+    On Ubuntu Linux:
+    ```
+    sudo apt install libsfml-dev
+    ```
+    On macOS
+    ```
+    brew install sfml
+    ```
+1. Change the source files listed in [`add_executable`](CMakeLists.txt#L6) to match the source files your project requires.
+1. Configure and build your project.
+
+   On Linux or macOS, run these commands from the root directory of your project.
+    ```cmake
+    cmake -B build
+    cmake --build build
+    ```
+
+    Alternatively, use [VS Code](https://code.visualstudio.com) with its [CMake extension](https://code.visualstudio.com/docs/cpp/cmake-linux) on any OS.
+1. Enjoy!
 
 ## More Reading
 
@@ -19,3 +41,7 @@ Here are some useful resources if you want to learn more about CMake:
 - [How to Use CMake Without the Agonizing Pain - Part 1](https://alexreinking.com/blog/how-to-use-cmake-without-the-agonizing-pain-part-1.html)
 - [How to Use CMake Without the Agonizing Pain - Part 2](https://alexreinking.com/blog/how-to-use-cmake-without-the-agonizing-pain-part-2.html)
 - [Better CMake YouTube series by Jefferon Amstutz](https://www.youtube.com/playlist?list=PL8i3OhJb4FNV10aIZ8oF0AA46HgA2ed8g)
+
+## License
+
+The source code is dual licensed under Public Domain and MIT -- choose whichever you prefer.