add auto_assign and assign bot

.github/auto_assign.yml

@@ -0,0 +1,23 @@
+# Set to true to add reviewers to pull requests
+addReviewers: true
+
+# Set to author to set pr creator as assignee
+addAssignees: author
+
+# A list of reviewers to be added to pull requests (GitHub user name)
+reviewers:
+  - benjaminhuo
+  - kehuili
+  - tpiperatgod
+
+# A list of keywords to be skipped the process that add reviewers if pull requests include it
+skipKeywords:
+  - wip
+
+# A number of reviewers added to the pull request
+# Set 0 to add all the reviewers (default: 0)
+numberOfReviewers: 1
+
+# A list of users to be skipped by both the add reviewers and add assignees processes
+skipUsers:
+  - dependabot[bot]

.github/workflows/assign.yml

@@ -0,0 +1,32 @@
+name: Assign issue
+
+on:
+  issue_comment:
+    types: [created]
+
+jobs:
+  assignbot:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Assign issue
+        uses: actions/github-script@v6
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const payload = context.payload;
+            const issue = context.issue;
+            const isFromPulls = !!payload.issue.pull_request;
+            const commentBody = payload.comment.body;
+
+            if (!isFromPulls && commentBody && commentBody.indexOf("/assign") == 0) {
+              if (!issue.assignees || issue.assignees.length === 0) {
+                await github.rest.issues.addAssignees({
+                  owner: issue.owner,
+                  repo: issue.repo,
+                  issue_number: issue.number,
+                  assignees: [context.actor],
+                })
+              }
+
+              return;
+            }