Added makefile.

Makefile

@@ -0,0 +1,23 @@
+test: target/test
+	./target/test
+
+build: target/build/tensor.o
+
+target/test: target/build/tests/test_tensor.o target/build/tests/main.o target/build/tensor.o
+	cc $^ -o target/test
+
+target/build/tests/main.o: tests/main.c
+	cc -c $? -o $@ -pedantic -Wall -Wextra
+
+target/build/tests/test_tensor.o: tests/test_tensor.c
+	cc -c $? -o $@ -pedantic -Wall -Wextra
+
+target/build/tensor.o: tensor.c
+	cc -c $? -o $@ -pedantic -Wall -Wextra
+
+init:
+	mkdir -p ./target/build/tests
+
+clean:
+	rm -f ./target/build/*.o
+	rm -f ./target/test