Added make clean

client/backend/Makefile

@@ -0,0 +1,18 @@
+CC := go
+NAME := peer
+OUT := bin/
+
+all: clean windows linux darwin
+
+windows: peer.go types.go
+	GOOS=$@ GOARCH=amd64 $(CC) build -o $(OUT)$(NAME)_$@.exe $^
+
+linux: peer.go types.go
+	GOOS=$@ GOARCH=amd64 $(CC) build -o $(OUT)$(NAME)_$@ $^
+
+darwin: peer.go types.go
+	GOOS=$@ GOARCH=amd64 $(CC) build -o $(OUT)$(NAME)_$@_amd64 $^
+	GOOS=$@ GOARCH=arm64 $(CC) build -o $(OUT)$(NAME)_$@_arm64 $^
+
+clean:
+	$(RM) -r bin/