add template

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+Please provide all information requested here
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Please provide a minimal Julia code example which reproduces the behavior (bug, performance regression, ...).
+An example is reproducible if it includes all steps allowing somebody else to get the same behavior as you are observing.
+If your example needs a dataset, reduce the size of the data so that it can be easily shared. If your dataset is private,
+try to reproduce the error with a publicly available dataset or randomly generated data. Do not send large files via email, but provide a download link to the dataset in the issue report.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Environment**
+- operating system: [e.g. Ubuntu XX.YY]
+- output of the julia command `versioninfo()`
+- do you use the official binaries from https://julialang.org/downloads/ ?
+- PhysOcean version
+
+**Full output**
+
+In case of an error, please paste the *full* error message and stack trace.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is.
+
+**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 (optional)**
+Add any other context about the feature request here.