add makefile used for all languages.

makefile

@@ -0,0 +1,46 @@
+bd = ./build/
+
+all: c d nim odin __python rust
+
+build-run: all
+	$(bd)c
+	$(bd)d
+	$(bd)nim
+	$(bd)odin
+	./snail.py
+	$(bd)rust
+
+run:
+	$(bd)c
+	$(bd)d
+	$(bd)nim
+	$(bd)odin
+	./snail.py
+	$(bd)rust
+
+clean:
+	rm -f $(bd)*
+
+c: snail.c
+	gcc -Wall -Wextra -pedantic $^ -o $(bd)$@
+	$(bd)$@
+
+d: snail.d
+	dmd $^ -of=$(bd)$@
+	$(bd)$@
+
+nim: snail.nim
+	nim c $^ && mv snail $(bd)$@
+	$(bd)$@
+
+odin: snail.odin
+	odin build . && mv *.bin $(bd)odin
+	$(bd)$@
+
+__python: snail.py
+	python3 $^
+
+rust: snail.rs
+	rustc $^ -o $(bd)$@
+	$(bd)$@
+