add community group and update issue template(#271)

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,10 @@
 blank_issues_enabled: true
 contact_links:
-  - name: "😊 Discussions"
-    url: https://github.com/hpcaitech/ColossalAI/discussions
-    about: Ask questions and discuss with other Colossal-AI community members in our forum
+  - name: ❓ Simple question - Slack Chat
+    url: https://join.slack.com/t/colossalaiworkspace/shared_invite/zt-z7b26eeb-CBp7jouvu~r0~lcFzX832w
+    about: This issue tracker is not for technical support. Please use our Slack chat, and ask the community for help.
+  - name: ❓ Simple question - WeChat
+    url: https://github.com/hpcaitech/ColossalAI/blob/main/docs/images/WeChat.png
+    about: This issue tracker is not for technical support. Please use WeChat, and ask the community for help.
+  - name: 😊 Advanced question - GitHub Discussions
+    url: https://github.com/hpcaitech/ColossalAI/discussions

.github/ISSUE_TEMPLATE/proposal.yml

@@ -0,0 +1,44 @@
+name: 💥 Proposal
+description: Propose a non-trivial change to Colossal-AI
+
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Common reasons for proposals include:
+
+        - Altering the infrastructure;
+        - Bumping a critical dependency's major version;
+        - A significant improvement in user-friendliness;
+        - Significant refactor;
+        - ...
+
+        Please note this is not for feature request or bug template; such action could make us identify the issue wrongly and close it without doing anything.
+
+        We give you maximum freedom to write an elaborated proposal illustrating why you think the change is beneficial for us, and what steps we should take to turn this into reality.
+
+
+  - type: textarea
+    attributes:
+      label: Proposal
+      description: A clear and concise description of what the proposal is.
+    validations:
+      required: true
+
+  - type: checkboxes
+    attributes:
+      label: Self-service
+      description: |
+        If you feel like you could contribute to this issue, please check the box below. This would tell us and other people looking for contributions that someone's working on it.
+        If you do check this box, please send a pull request within 7 days after a maintainer's approval so we can still delegate this to someone else.
+
+        Proposals usually involve significant code changes, so please reach consensus with the maintainers before rushing to implement it, and make sure you follow the [Contributing Guidelines](https://github.com/hpcaitech/ColossalAI/blob/main/CONTRIBUTING.md).
+        This ensures that you don't waste your time and we don't waste ours reading the large diffs.
+      options:
+        - label: I'd be willing to do some initial work on this proposal myself.
+
+
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!