small fix

makefile

@@ -1,8 +1,13 @@
-.PHONY: build
+.PHONY: all build install
 
 all: build
 
-build: build/files-server
+build: build/file-server
 
-build/files-server: cmd/file-server/main.go internal/handler/*.go
-	go build -o build/files-server cmd/file-server/main.go
+build/file-server: cmd/file-server/main.go internal/handler/*.go
+	go build -o build/file-server cmd/file-server/main.go
+
+install: build
+	mkdir -p /usr/share/file-server/static
+	install -m755 -t /usr/share/file-server build/file-server
+	install -m755 -t /usr/share/file-server/static static/main.html