Added Searching Algorithms folder in Java (Linear, Binary, Jump, Interpolation, Exponential, Ternary)

[iTusharyadav]

This PR implements multiple searching algorithms in Java and organizes them under the folder Java/Searching/.
It addresses Issue #173.

Algorithms included:

1. Linear Search
2. Binary Search
3. Jump Search
4. Interpolation Search
5. Exponential Search
6. Ternary Search

Checklist:

• Folder Searching algorithm created
• 6 algorithms implemented with test examples
• Code properly commented
• Successfully compiled and ran all programs locally
• Add hacktoberfest-accepted label after PR is approved

Notes for Maintainers:

• This PR follows the proposed structure for the repo to improve organization.
• Future searching algorithms in Java can be added to this folder following the same structure.
• Please ensure the hacktoberfest-accepted label is added once merged, so this contribution counts for Hacktoberfest 2025.