Add interview prep README

Author: sushildalavi

README.md

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+# LeetCode Solutions and Interview Prep
+
+This repository tracks my data structures and algorithms practice for technical interview preparation.
+
+The plan is simple:
+
+1. Finish `NeetCode 150`
+2. Move to `NeetCode 250`
+3. Complete `Striver's SDE Sheet`
+4. Continue with regular LeetCode and DSA practice for revision, speed, and pattern recognition
+
+Solutions in this repository are synced from LeetCode using `LeetSync`, so this repo serves as both a progress log and a long-term archive of interview prep work.
+
+## Roadmap
+
+| Phase | Track | Focus | Status |
+| --- | --- | --- | --- |
+| 1 | NeetCode 150 | Core interview patterns and must-know problems | In Progress |
+| 2 | NeetCode 250 | Wider medium and hard problem coverage | Planned |
+| 3 | Striver's SDE Sheet | Structured revision across core DSA topics | Planned |
+| 4 | Mixed Practice | Timed practice, weak-topic review, and consistency | Ongoing |
+
+## Goals
+
+- Build strong problem-solving fundamentals in DSA
+- Improve pattern recognition across common interview problem types
+- Write clean, efficient, interview-ready solutions
+- Track progress consistently over time
+- Create a reusable revision resource before interviews
+
+## What This Repository Will Contain
+
+- LeetCode problem solutions synced through `LeetSync`
+- Consistent practice across arrays, strings, linked lists, trees, graphs, dynamic programming, heaps, backtracking, and more
+- A growing archive of solved problems for revision
+- Progress tied to structured interview prep sheets rather than random practice
+
+## Current Prep Order
+
+`NeetCode 150` -> `NeetCode 250` -> `Striver's SDE Sheet` -> `Ongoing DSA Practice`
+
+## Problem-Solving Approach
+
+For each problem, the focus is to:
+
+1. Understand the brute-force solution first
+2. Identify the optimal pattern or data structure
+3. Implement a clean and readable solution
+4. Review time and space complexity
+5. Revisit difficult problems until the pattern becomes natural
+
+## Progress Tracker
+
+- NeetCode 150: `0 / 150`
+- NeetCode 250: `0 / 250`
+- Striver's SDE Sheet: `Not started`
+
+This section will be updated as the repository grows.
+
+## Why This Repo Exists
+
+This is not just a dump of accepted submissions. The goal is to build a disciplined interview prep system:
+
+- solve consistently
+- track progress publicly
+- revise weak areas
+- maintain a personal archive of patterns and solutions
+
+## Tools
+
+- `LeetCode`
+- `LeetSync`
+- `GitHub`
+
+## Long-Term Objective
+
+Use this repository as a structured record of interview preparation and a revision base for software engineering interviews.