feat: add operator overloading examples

[ghimiresdp]

SUMMARY

Add operator overloading examples

• Score sheet addition and subtraction
• Matrix Multiplication
• Scalar Multiplication

Example:

fn main(){
  let score_a = Score {
      goals: 2,
      penalties: 2,
  };
  let score_b = Score {
      goals: 1,
      penalties: 3,
  };

  let score_c = score_a + score_b;
}

Feature Type

• New Feature
• Refactoring
• Bug Fix
• Documentation
• Unit Tests

TARGET

• Data Structure
• Algorithm
• Design Pattern
• Problem Solving
• Complexity Analysis
• Advanced Concept
• Project