Create CHANGELOG.md

Author: TimGoTheCreator

CHANGELOG.md

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+# NEXT 2026.02.03
+
+#### Major changes:
+
+Added Barnes Hut Octree ( O (N log N)) 
+Added VTK/VTU output
+Added splash screen on start + precision and threads are printed
+
+#### Minor changes:
+Changed naming scheme to CalVer YYYY-MM-DD
+Added the following examples:
+- TwoDifferentGalaxies
+- ColdCollapseGalaxy
+- GalaxyDemo
+
+---
+
+# The first release of NEXT
+## Features:
+O(N²) 
+Basic simulation
+Loading initial conditions (txt struct positions)