Add IGA Validation Examples

[AakashR003]

Description

This PR introduces 5 validation cases for the Isogeometric Analysis (IGA) application in Kratos.

Validation Cases (newly added)

The following validation cases are added in the IGA validation module:

1. Buckling Analysis - Single Patch - Cantilever Beam

• Validates buckling analysis using Shell3pElement
• Single NURBS patch
• Buckling load factors validated

2. Geometric Linear Analysis - Single Patch - Scordelis-Lo Roof

• Shell3pElement validation with Scordelis-Lo Roof for geometric linearity
• Single NURBS patch
• Displacement results validated

3. Geometric Linear Analysis - Trimmed Patch - Plate with Hole

• Plate with circular hole under bending
• Trimmed NURBS patch analysis
• Displacement results validated

4. Geometric Non-Linear Analysis - Multi Patch - Cantilever Beam

• Geometric nonlinear analysis with multiple patches
• Connected NURBS patches with nonconforming elements
• Load-displacement curve validated

5. Geometric Non-Linear Analysis - Single Patch - Cantilever Beam

• Geometric nonlinear analysis with single patch
• Single NURBS patch
• Load-displacement curve validated

Modifications made to existing files

Files Modified:

• README.md - in examples/iga
• README.md - in examples/iga/validation

[juancamarotti]

Looks good to me. Nice work! Thanks for the help

[rickyaristio]

I also have no more comments. Good job!