Initial open source version

Description

This is the initial open source version and includes

• Add report_generator and GUI
• Add submodule libs, gitignore, gitmodules, git attributes, CMakeLists and CMakePreset
• Add LICENCE, CODEOWNERS and README

.gitlab/issue_templates/Default.md

+<!-- Title: Provide a concise and descriptive title for the issue incl. tool or library name -->
+
+## Choose Your Issue Template
+Before creating an issue, please review existing issues to avoid duplicates!
+ALso, select the **appropriate type for your issue in the desciption drop-down**. 
+- Bug Report Template
+- Feature Request Template
+- TODO Template
+- Documentation Request Template
+- Testing Request Template
+
+If not suitable, use the sections below and contact the owners.
+
+## Description
+Provide a concise description of the issue.
+
+## Additional Context
+Add screenshots, logs, or relevant information here.