[CI] Add doc bot (#6)

* [workflow] Add a pull request template

* [CI] Add doc bot

.github/PULL_REQUEST_TEMPLATE.md

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+
+<!--
+### Contribution Checklist
+
+  - Fill out the template below to describe the changes contributed by the pull request. That will give reviewers the context they need to do the review.
+  
+  - Each pull request should address only one issue, not mix up code from multiple issues.
+  
+  - Each commit in the pull request has a meaningful commit message
+
+  - Once all items of the checklist are addressed, remove the above text and this checklist, leaving only the filled out template below.
+
+**(The sections below can be removed for hotfixes of typos)**
+-->
+
+*(If this PR fixes a github issue, please add `Fixes #<xyz>`.)*
+
+Fixes #<xyz>
+
+*(or if this PR is one task of a github issue, please add `Master Issue: #<xyz>` to link to the master issue.)*
+
+Master Issue: #<xyz>
+
+### Motivation
+
+*Explain here the context, and why you're making that change. What is the problem you're trying to solve.*
+
+### Modifications
+
+*Describe the modifications you've done.*
+
+### Verifying this change
+
+- [ ] Make sure that the change passes the CI checks.
+
+*(Please pick either of the following options)*
+
+This change is a trivial rework / code cleanup without any test coverage.
+
+*(or)*
+
+This change is already covered by existing tests, such as *(please describe tests)*.
+
+*(or)*
+
+This change added tests and can be verified as follows:
+
+*(example:)*
+  - *Added integration tests for end-to-end deployment with large payloads (10MB)*
+  - *Extended integration test for recovery after broker failure*
+
+### Documentation
+
+Check the box below.
+
+Need to update docs? 
+
+- [ ] `doc-required` 
+
+  (If you need help on updating docs, create a doc issue)
+
+- [ ] `no-need-doc` 
+
+  (Please explain why)
+
+- [ ] `doc` 
+
+  (If this PR contains doc changes)
+

.github/workflows/documentbot.yml

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+
+#
+# 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.
+#
+
+name: Auto Labeling
+
+on:
+  pull_request_target :
+    types:
+      - opened
+      - edited
+      - labeled
+
+
+
+# A GitHub token created for a PR coming from a fork doesn't have
+# 'admin' or 'write' permission (which is required to add labels)
+# To avoid this issue, you can use the `scheduled` event and run
+# this action on a certain interval.And check the label about the
+# document.
+
+jobs:
+  labeling:
+    if: ${{ github.repository == 'streamnative/pulsar-io-template' }}
+    permissions:
+      pull-requests: write 
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+
+      - uses: streamnative/github-workflow-libraries/doc-label-check@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          label-pattern: '- \[(.*?)\] ?`(.+?)`' # matches '- [x] `label`'
+