[#29] Add issue templates

.github/ISSUE_TEMPLATE/bug.md

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+---
+name: Bug
+about: Create a report to help improve the project's infrastructure
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+A bug should describe an infrastructure problem, for example: LaTeX reports an error, the virtualized environment fails etc.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Environment (please complete the following information):**
+ - OS: [e.g. iOS]
+-  Virtualization [e.g. None or Docker]
+ - LaTeX distribution [e.g. TexLive]
+ - Document version [e.g. 13.0.10.8.13]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/suggestion.md

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+---
+name: Suggestion
+about: Create a suggestion to improve and enhance the document itself
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Describe the suggestion**
+A short summary what kind of content you'd like to change.
+
+**Changes in existing chapter ABC**
+Either refer to the PDF page number or the chapter you'd like to address.
+Cite the original text and add your comments or changes below it.
+
+**New text, new chapter etc.**
+If you'd like to see a new chapter with some more exiting content, great!
+Please write down what kind of chapter you think could help improving the project.
+Any kind of suggestion, like keywords, notes or even prewritten texts would be of great help here.
+Please add also where inside the document the new chapter should be arranged.
+
+**Scientific sources**
+If you can, please add a scientific source like a paper, book or some other kind of source.
+This helps to decide how the suggestion can be integrated.
+It might be useful to provide the source if necessary so that a reviewer can understand the suggestion and act upon it.