Add new template for bugs

.gitlab/issue_templates/Bug.md

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+<!--
+Thanks for wanting to report an issue you've found. Please delete
+this text and fill in the template below. If unsure about something, just do as
+best as you're able.
+
+Note that it will be much easier for us to fix the issue if a test case that
+reproduces the problem is provided. Ideally this test case should not have any
+external dependencies. We understand that it is not always possible to reduce
+your code to a small test case, but we would appreciate to have as much data as
+possible. Thank you!
+-->
+
+### Prerequisites
+<!--
+You do not have to reinstall Firefox or disable all addons. You can just create a new profile that only has ClearURLs installed and where no settings are changed. Instructions can be found here: https://support.mozilla.org/en-US/kb/profile-manager-create-and-remove-firefox-profiles
+-->
+* [ ] Can you reproduce the problem in a **fresh** firefox profile with **only** ClearURLs?
+* [ ] Are you running the latest version of ClearURLs?
+* [ ] Are you have changed settings under `about:config`?
+
+### Description
+
+[Description of the bug or feature]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+**Expected behavior:** [What you expected to happen]
+
+**Actual behavior:** [What actually happened]
+
+### System
+* **Version**: [compulsory. you must provide your version]
+* **Platform**: [either `uname -a` output, or if Windows, version and 32-bit or
+  64-bit]
+
+### Log
+<!-- Please enable the log functionality of ClearURLs and copy your log into this table. -->
+<!-- Or if the log is to long, save the html file (press ctrl+s) and attach to this issue the `Log from ClearURLs.html` file -->
+
+| Before processing | After processing | Rule | Time |
+|-------------------|------------------|------|------|
+|                   |                  |      |      |
+
+<!-- If you attach the html file, please copy into the ``` area -->
+```
+
+
+
+
+
+```