Add optical logic gate implementations (AND/OR)

[Copilot]

Implements optical computing logic gates as Verilog modules per issue request.

Changes

• optical_and_gate.v - AND gate using nonlinear optical interaction (four-wave mixing, cross-phase modulation in MoS2/GaAs)
• optical_or_gate.v - OR gate using passive beam coupling (Y-branch waveguides, directional couplers)
• optical_gates_testbench.v - Verification testbench covering all input combinations

module optical_and_gate (
    input wire A,  // Optical Input A (0=no light, 1=light)
    input wire B,  // Optical Input B (0=no light, 1=light)
    output wire Y  // Optical Output Y
);
    // Both beams required for nonlinear optical interaction
    assign Y = A & B;
endmodule

Each module documents physical implementation principles (materials, techniques) bridging optical computing theory with digital logic representation.

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Original prompt

---

This section details on the original issue you should resolve

<issue_title>Build either of them using a type of optical gate.</issue_title>
<issue_description></issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Build either of them using a type of optical gate. #28

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