docs: add pull request and issue templates

Signed-off-by: Qinqi Qu <[email protected]>

.github/ISSUE_TEMPLATE.md

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+## Additional Information
+_The following information is very important in order to help us to help you. Omission of the following details may delay your support request or receive no attention at all._
+
+### Version of nydus being used (nydusd --version)
+
+<!-- Example:
+
+Version:        v2.2.0
+Git Commit:     a38f6b8d6257af90d59880265335dd55fab07668
+Build Time:     2023-03-01T10:05:57.267573846Z
+Profile:        release
+Rustc:          rustc 1.66.1 (90743e729 2023-01-10)
+
+-->
+
+### Version of nydus-snapshotter being used (containerd-nydus-grpc --version)
+
+<!-- Example:
+
+Version:     v0.5.1
+Revision:    a4b21d7e93481b713ed5c620694e77abac637abb
+Go version:  go1.18.6
+Build time:  2023-01-28T06:05:42
+
+-->
+
+### Kernel information (uname -r)
+_command result: uname -r_
+
+### GNU/Linux Distribution, if applicable (cat /etc/os-release)
+_command result: cat /etc/os-release_
+
+### containerd-nydus-grpc command line used, if applicable (ps aux | grep containerd-nydus-grpc)
+```
+```
+
+### client command line used, if applicable (such as: nerdctl, docker, kubectl, ctr)
+```
+```
+
+## Details about issue
+

.github/PULL_REQUEST_TEMPLATE.md

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+## Relevant Issue (if applicable)
+_If there are Issues related to this PullRequest, please list it._
+
+## Details
+_Please describe the details of PullRequest._
+
+## Types of changes
+
+_What types of changes does your PullRequest introduce? Put an `x` in all the boxes that apply:_
+
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+- [ ] Documentation Update (if none of the other choices apply)
+
+## Checklist
+
+_Go over all the following points, and put an `x` in all the boxes that apply._
+
+- [ ] I have updated the documentation accordingly.
+- [ ] I have added tests to cover my changes.