Create user documentation for different types of slab and footing reinforcement process.

[ShivCharanSharma]

Create user documentation and tutorials for the following types of slab and footing reinforcement process.

• [x] Straight rebars slab reinforcement
• [x] U-Shaped rebars slab reinforcement
• [x] L-Shaped rebars slab reinforcement
• [x] Reinforcement of slab spanning in one direction
• [x] Reinforcement of slab spanning in two directions
• [x] Reinforcement process of column footing