FEATURE: some Makefile rules to make compilation easier (#23)

i thought adding very simple `Makefile` rules to compile, run the
application and clean the repo could be helpful 😌

i never remember the `cmake` commands and copy-pasting them from the
`README` is not the best to me 🤔

this PR adds
- `make build` to compile the source
- `make run` to run the compiled application => it takes care of the `cd
bin`
- `make clean` to clean the compilation files

there is also a little note in the `README` to link users to the
`Makefile` 👍

> **Note**
> see the
[`README`](https://github.com/amtoine/wiresmash/tree/feature/little-makefile-wrapper-to-compile#building-with-cmake)
and the
[`rules`](https://github.com/amtoine/wiresmash/blob/feature/little-makefile-wrapper-to-compile/Makefile)

Makefile

@@ -0,0 +1,17 @@
+BUILD_DIR = "./build/"
+BIN_DIR = "./bin/"
+APP = "app"
+
+build:
+	cmake -S ./ -B ${BUILD_DIR}
+	cmake --build ${BUILD_DIR}
+
+run:
+	( \
+		cd ${BIN_DIR}; \
+		./${APP}; \
+	)
+
+clean:
+	rm -rf ${BIN_DIR}
+	rm -rf ${BUILD_DIR}

README.md

@@ -57,6 +57,17 @@ cmake --build ./build/
 
 to build the executable. You will find the build executable in the `./bin` folder.
 
+> **Note**
+> you can directly use the `build`, `run` and `clean` rules for `make` instead
+> ```bash
+> make build run
+> ```
+> to run the application and
+> ```bash
+> make clean
+> ```
+> to clean all compilation files
+
 ## Future Plans
 
 - A simple combat prototype with attacks and HP bars