adding an ISSUE_TEMPLATE for bug reporting

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,29 @@
+#### Submission type
+
+  - [ ] Bug report
+  - [ ] Feature Request
+
+
+#### Info regarding which version of Calamares is used, which Distribution
+
+> …
+
+#### Provide information on how the disks are set up, in detail, with full logs of commands issued 
+
+> …
+
+#### What do you expect to have happen when Calamares installs?
+
+> …
+
+#### Describe the issue you encountered
+
+> …
+
+#### Steps to reproduce the problem
+
+> …
+
+#### Include the installation.log:
+
+> …