Create Github issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve gopsutil
+
+---
+
+**Describe the bug**
+[A clear and concise description of what the bug is.]
+
+**To Reproduce**
+```go
+// paste example code reproducing the bug you are reporting
+```
+
+**Expected behavior**
+[A clear and concise description of what you expected to happen.]
+
+**Environment (please complete the following information):**
+ - [ ] Windows: [paste the result of `ver`]
+ - [ ] Linux: [paste contents of `/etc/os-release` and the result of `uname -a`]
+ - [ ] Mac OS: [paste the result of `sw_vers` and `uname -a`
+ - [ ] FreeBSD: [paste the result of `freebsd-version -k -r -u` and  `uname -a`]
+ - [ ] OpenBSD: [paste the result of `uname -a`]
+
+**Additional context**
+[Cross-compiling? Paste the command you are using to cross-compile and the result of the corresponding `go env`]

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for gopsutil
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+[A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]]
+
+**Describe the solution you'd like**
+[A clear and concise description of what you want to happen.]
+
+**Describe alternatives you've considered**
+[A clear and concise description of any alternative solutions or features you've considered.]
+
+**Additional context**
+[Add any other context or screenshots about the feature request here.]