Include release notes

Include initial release notes

docs/download/release-notes.md

+### 🚀 Version 0.5.0 - 2025-02-28
+
+!!! note
+	🎉 First official release of UNICADO!
+
+#### 🛠 Features
+
+- Open source code in C++ and Python of conceptual aircraft design and assessment tools, custom libraries, additional tools, and workflow
+- Clean sheet design, parameter studies and calibrations possible in UNICADO workflow
+- Example design of an short/medium range aircraft with HTML reports
+
+| Parameter            | Value  | Unit |
+| -------------------- | ------ | ---- |
+| Maximum takeoff mass | 78910  | kg   |
+| Operating empty mass | 44664  | kg   |
+| Maximum useable fuel | 657977 | MJ   |
+| Numbers of iteration | 5 (+1) |      |
+
+#### 📌 Parameter studies results
+Following top-level aircraft parameter studies were successful and showed reasonable results: 
+
+- Number of passenger, passenger & cargo mass
+- Required takeoff and landing length & approach speed
+- Design mission: range, initial cruise mach number and altitude, maximum operating mach number, delta ISA
+- Friction and braking coefficient
+- Fuselage type (single and wide body), different class distributions as well as undercarriage retractability
+- Different engine positions and numbers
+
+!!! important
+	Parameter studies of tool setting are in progress and will be updated on the website asap
+
+#### ⭐ Upcoming in next release
+
+- Implementation of existing geometry usage
+- Implementation of CPACS interface
+- Improvement of optimization framework integration in UNICADO workflow 
+
+Known issues are in the GitLab 🐞 Issue board: [Link](https://git.rwth-aachen.de/groups/unicado/-/issues)