small fix

makefile

@@ -1,4 +1,4 @@
-.PHONY: build
+.PHONY: all build install
 
 all: build
 
@@ -6,3 +6,8 @@ build: build/files-server
 
 build/files-server: cmd/file-server/main.go internal/handler/*.go
 	go build -o build/files-server cmd/file-server/main.go
+
+install: build
+	mkdir -p /usr/share/file-server/static
+	install -m755 -t /usr/share/file-server build/files-server
+	install -m755 -t /usr/share/file-server/static static/main.html