Added install routine to CMake and added a classic Makefile as a wrapper for easy building.

Makefile

@@ -0,0 +1,28 @@
+all:
+	make clean
+	make fun
+	make fun_test
+	make test_opcodes
+
+fun:
+	cmake -S . -B build -DFUN_DEBUG=ON
+	cmake --build build --target fun
+
+fun_test:
+	cmake -S . -B build -DFUN_DEBUG=ON
+	cmake --build build --target fun_test
+
+clean:
+	cmake --build build --target clean-build
+
+# Or set a custom prefix: cmake --install build --prefix "$HOME/.local"
+# Defaults:
+# Binary: /usr/bin/fun
+# Docs: /share/doc/fun/README.md, LICENSE
+# Examples: /share/fun/examples/*.fun
+install:
+	cmake --install build
+
+test_opcodes:
+	cmake -S . -B build -DFUN_DEBUG=ON
+	cmake --build build --target test_opcodes