Add ISSUE_TEMPLATE

.github/ISSUE_TEMPLATE/bugs.md

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+---
+name: "🐛 Bugs"
+about: Report bugs in DETR
+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:
+```
+python -m torch.utils.collect_env
+```

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

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+---
+name: "How to do something❓"
+about: How to do something using DETR?
+
+---
+
+## ❓ How to do something using DETR
+
+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](https://github.com/facebookresearch/detr/issues/new/choose) 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 DETR, 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

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+---
+name: "Unexpected behaviors"
+about: Run into unexpected behaviors when using DETR
+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:
+
+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.
+
+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 DETR model zoo.
+(2) It indicates a DETR bug.
+
+## Environment:
+
+Provide your environment information using the following command:
+```
+python -m torch.utils.collect_env
+```