Create ISSUE_TEMPLATE.md

Based on this documentation, I've added a file with an issue template: https://help.github.com/articles/helping-people-contribute-to-your-project/

.github/ISSUE_TEMPLATE.md

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+***Before you open an issue, you should search for similar issues.
+Especially for issues that deal with starting the docker-registry-frontend we have seen a tremendous amount
+of issues and most of the time a reference to the [example-setup](https://github.com/kwk/docker-registry-frontend/tree/v2/example-setup)
+folder was enough for the issue reporter to solve the issue on her own.***
+
+Please, make sure to provide all the information asked for below and then delete everything above **Expected behavior** including this line.
+
+## Expected behavior
+
+- [x] *Please describe what you tried to do and what you expect the software to act like.*
+
+## Actual behavior
+
+- [x] *Please describe what happened instead of the expected behavior.*
+
+## Steps to reproduce the problem
+
+- [x] *Please describe how a developer can reproduce the issue that you faced.
+Make sure you include information how you configured or started the registry and the frontend.*
+
+## Specifications
+
+ - [x] Which version of docker (`docker version`) are you running?
+ - [x] Which operating system do you use?
+ - [x] Which version of the docker-registry-frontend are you running?
+  * If you have the frontend running already you can find the version at the very bottom on every page.
+  * Otherwise you can provide the output of `docker images | grep "docker-registry-frontend"`.