Create 1.5.0.6.md

Yep, one day after 1.5.0.5 release :l

Author: OddMorning

Changelogs/1.5.0.6.md

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+# Changelog for 1.5.0.6 (2023-??-??)
+
+## Fixes
+* Broken "Default Timeline Length" option
+* Hanging pieces of UI on rendered videos and screenshots
+* Screenshots not being part of "Renders" folder
+
+## Other
+* Preferences: auto enable "Lock Track Duration" if "Sync Track And Song Duration" is checked