update issue template

.github/ISSUE_TEMPLATE/bugs.md

@@ -0,0 +1,36 @@
+---
+name: "🐛 Bugs"
+about: Report bugs in fastreid
+title: Please read & provide the following
+
+---
+
+## Instructions To Reproduce the 🐛 Bug:
+
+1. what changes you made (`git diff`) or what code you wrote
+```
+<put diff or code here>
+```
+2. what exact command you run:
+3. what you observed (including __full logs__):
+```
+<put logs here>
+```
+4. please simplify the steps as much as possible so they do not require additional resources to
+	 run, such as a private dataset.
+
+## Expected behavior:
+
+If there are no obvious error in "what you observed" provided above,
+please tell us the expected behavior.
+
+## Environment:
+
+Provide your environment information using the following command:
+
+```
+wget -nc -q https://github.com/facebookresearch/detectron2/raw/master/detectron2/utils/collect_env.py && python collect_env.py
+```
+
+If your issue looks like an installation issue / environment issue,
+please first try to solve it yourself with the instructions in

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,9 @@
+# require an issue template to be chosen
+blank_issues_enabled: false
+
+# Unexpected behaviors & bugs are split to two templates.
+# When they are one template, users think "it's not a bug" and don't choose the template.
+#
+# But the file name is still "unexpected-problems-bugs.md" so that old references
+# to this issue template still works.
+# It's ok since this template should be a superset of "bugs.md" (unexpected behaviors is a superset of bugs)

.github/ISSUE_TEMPLATE/questions-help-support.md

@@ -0,0 +1,22 @@
+---
+name: "How to do something❓"
+about: How to do something using fastreid? What does an API do?
+
+---
+
+## ❓ How to do something using fastreid
+
+Describe what you want to do, including:
+
+1. what inputs you will provide, if any:
+2. what outputs you are expecting:
+
+NOTE:
+
+1. Only general answers are provided.
+   If you want to ask about "why X did not work", please use the
+   [Unexpected behaviors]() issue template.
+
+2. About how to implement new models / new dataloader / new training logic, etc., check documentation first.
+
+3. We do not answer general machine learning / computer vision questions that are not specific to fastreid, such as how a model works, how to improve your training/make it converge, or what algorithm/methods can be used to achieve X.

.github/ISSUE_TEMPLATE/unexpected-problems-bugs.md

@@ -0,0 +1,35 @@
+---
+name: "Unexpected behaviors"
+about: Run into unexpected behaviors when using fastreid
+title: Please read & provide the following
+
+---
+
+If you do not know the root cause of the problem, and wish someone to help you, please
+post according to this template:
+
+## Instructions To Reproduce the Issue:
+
+Check https://stackoverflow.com/help/minimal-reproducible-example for how to ask good questions.
+Simplify the steps to reproduce the issue using suggestions from the above link, and provide them below:
+
+1. full code you wrote or full changes you made (`git diff`)
+```
+<put code or diff here>
+```
+2. what exact command you run:
+3. __full logs__ you observed:
+```
+<put logs here>
+```
+
+## Expected behavior:
+
+If there are no obvious error in "what you observed" provided above,
+please tell us the expected behavior.
+
+If you expect the model to converge / work better, note that we do not give suggestions
+on how to train a new model.
+Only in one of the two conditions we will help with it:
+(1) You're unable to reproduce the results in fastreid model zoo.
+(2) It indicates a fastreid bug.