lerentis's changes (#12)

Changes from lerentis's fork.

Co-authored-by: Tobias Trabelsi <lerentis@uploadfilter24.eu>
Reviewed-on: https://gitea.com/gitea/terraform-provider-gitea/pulls/12

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,28 @@
+---
+name: Bug report
+about: Create a report to improve the provider
+title: ''
+labels: 'bug'
+assignees: ''
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Log Output**
+If applicable, add logs to help explain your problem.
+
+**Additional Data**
+Important for reproducability.
+
+- Terraform Version
+
+- Operating System
+
+- Provider Version