feat: add some challenge solutions ✨

[kareemmahlees]

• Adds challenge solution for wc. 64f56582ed6968451b563485a4c6d0ee4c018b16
• Adds challenge solution for json-parser. ea8924ec72a14c823108190df5234502d9e9a7a9
• Adds challenge solution for huffman. c7d03da0241270d00c478890e168b4dbb2513f64
• Adds challenge solution for load-balancer. 4a7e0805af44de46b0ae80199190ffb1d8eb1cfb
• Adds challenge solution for redis-server. b1a545496c8d38e1d2e4812763e7b9644afd2b26