chore: Add Makefile for consistency

Makefile

@@ -0,0 +1,28 @@
+# Copyright The ORAS Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+.PHONY: build
+build: install
+	npm run build
+
+.PHONY: install
+install:
+	npm install
+
+.PHONY: serve
+serve: build
+	npm run serve
+
+.PHONY: server
+server: server
+	npm run serve