docs: add readme for install Apache APISIX Dashboard with RPM package (#1273)

* docs: add readme for install Apache APISIX Dashboard with RPM package.

* fixed typo

* use a new file to have detailed

* fixed typo

* Update deploy-with-rpm.md

* Update deploy-with-rpm.md

* Update docs/deploy-with-rpm.md

Co-authored-by: litesun <sunyi@apache.org>

Co-authored-by: 琚致远 <juzhiyuan@apache.org>
Co-authored-by: litesun <sunyi@apache.org>

Author: 3 people

README.md

@@ -73,6 +73,7 @@ Support the following ways currently.
 
 - [Source Codes](./docs/deploy.md)
 - [Docker](./docs/deploy-with-docker.md)
+- [RPM package（only for CentOS 7）](./docs/deploy-with-rpm.md)
 
 ## Development
 

docs/deploy-with-rpm.md

@@ -0,0 +1,38 @@
+<!--
+#
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You 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.
+#
+-->
+
+# Deploy with RPM
+
+**NOTE:** Only support CentOS 7 currently, for more information, please refer to [here](./deploy.md).
+
+## Install from RPM
+
+```sh
+$ sudo yum install -y https://github.com/apache/apisix-dashboard/releases/download/v2.3/apisix-dashboard-v2.3-1.x86_64.rpm
+```
+
+## Run
+
+Before you start, make sure the following dependencies are installed and running in your environment.
+
+- [etcd](https://etcd.io/docs/v3.4.0/dl-build/) 3.4.0+
+
+```sh
+$ sudo nohup manager-api -p /usr/local/apisix/dashboard/ &
+```