feat: readme hindi support

[vakrahul]

Summary

Add Hindi translation (README.hi.md) and update language navigation in all README files to include हिन्दी link. This makes XMem accessible to Hindi-speaking developers across India and other regions.

Motivation / Problem

Closes #219

Changes

• Created new README.hi.md file with complete Hindi translation of core documentation
• Updated language navigation links in README.md, README.zh-CN.md, and README.ja.md to include Hindi link
• Translated all critical sections:
  • Hero / Introduction and tagline
  • What is XMem? (core concept and philosophy)
  • Features (Chrome Extension, Agent Plugins, Context, Scanner, Multi-Domain Classification)
  • Architecture (Ingestion Flow, Retrieval Flow, Storage)
  • Quickstart and Configuration
  • Technical content and code examples

Language selector now displays:

[English] • [简体中文] • [日本語] • [हिन्दी]

Testing

• Verified all language links are working and navigation is consistent across all README files
• Confirmed Hindi README renders properly on GitHub with correct Devanagari script
• Validated that all section anchors are properly localized (e.g., #विशेषताएं, #आर्किटेक्चर)
• Manual review of translations for accuracy and technical terminology

[gemini-code-assist]

Code Review

This pull request introduces a Hindi translation of the README (README.hi.md) and adds corresponding navigation links to the other README files. The review feedback focuses on correcting several translation inaccuracies in the Hindi version, most notably correcting the translation of "temporal" (which was mistranslated as "temporary"/"अस्थायी" instead of "time-based"/"समय-आधारित"), fixing grammatical errors, and improving sentence flow to make the translation more natural and idiomatic.

Important

The consumer version of Gemini Code Assist on GitHub is being sunset. Starting June 18, 2026, new organization installations will be blocked, and all code review activity will officially cease on July 17, 2026.
For more details on the timeline and next steps, please review the Help Documentation.

[greptile-apps]

Greptile Summary

This PR adds a complete Hindi translation (README.hi.md) and updates the language navigation bar in all existing README files to include the new हिन्दी link.

• README.hi.md: New 433-line Hindi translation covering all sections — introduction, features, architecture (with ASCII flow diagrams), benchmarks, quickstart, and configuration.
• README.md / README.zh-CN.md / README.ja.md: Each receives a single-line addition linking to README.hi.md in the language selector.

Confidence Score: 5/5

Documentation-only change; no code is modified and no runtime behavior is affected.

All four changed files are Markdown documentation. The three existing READMEs each receive a single well-formed link addition. The new Hindi README is a faithful translation with no broken links or missing sections, save for a duplicated table row in the Storage section that only affects visual rendering.

README.hi.md — the Neo4j row in the Storage table has an extra pair of <td> cells that should be removed before merge.

Important Files Changed

Filename	Overview
README.hi.md	New Hindi translation of the full README; complete and well-structured, but the Storage table's Neo4j row has 5 <td> cells instead of the expected 3, causing a rendering defect.
README.md	Added Hindi language link to navigation bar; single-line addition, no issues.
README.zh-CN.md	Added Hindi language link to navigation bar; single-line addition, no issues.
README.ja.md	Added Hindi language link to navigation bar; single-line addition, no issues.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[README.md\nEnglish] -->|lang nav| B[README.zh-CN.md\n简体中文]
    A -->|lang nav| C[README.ja.md\n日本語]
    A -->|lang nav NEW| D[README.hi.md\nहिन्दी]
    B -->|lang nav| A
    B -->|lang nav| C
    B -->|lang nav NEW| D
    C -->|lang nav| A
    C -->|lang nav| B
    C -->|lang nav NEW| D
    D -->|lang nav| A
    D -->|lang nav| B
    D -->|lang nav| C

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_{Reviews (3): Last reviewed commit: "Update README.hi.md" | Re-trigger Greptile}

[vakrahul]

@ved015 @ishaanxgupta