feat: add initial People Playground mod development kit

mods/SledgeHammer-Enhanced/README.txt

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+SledgeHammer-Enhanced
+====================
+
+An upgraded version of the classic sledgehammer with enhanced physics, visual effects, and audio feedback.
+
+Enhanced Features
+----------------
+• Improved weight and impact physics
+• Enhanced visual effects on impact
+• Realistic sound effects
+• Better handling and swing mechanics
+• Particle effects on collision
+
+Advanced Functionality
+--------------------
+• Dynamic damage based on swing velocity
+• Environmental interaction effects
+• Enhanced durability system
+• Custom impact sounds for different surfaces
+
+Usage Instructions
+------------------
+1. Enable the mod in your mod manager
+2. Locate the enhanced sledgehammer in the weapons section
+3. Experiment with different swing speeds for varied effects
+4. Try hitting different objects to see unique reactions
+
+Technical Improvements
+---------------------
+This enhanced version demonstrates:
+• Advanced physics calculations
+• Multi-sprite object implementation
+• Custom sound effect integration
+• Particle system utilization
+• Event-driven impact detection