Create README.md for VS Menu project

Added detailed README for VS Menu, outlining features, build notes, and credits.

Author: TerryS94

README.md

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+# VS Menu (Vampire Survivors Overlay)
+
+A small in-game overlay for Vampire Survivors that lets you view/tweak a bunch of run-time stuff.
+
+In the beginning it was only intended to be a stat editor, hence the repo name but ended up poking at several more things as time went on :)
+
+<img width="318" height="1199" alt="image" src="https://github.com/user-attachments/assets/0a817ad1-774d-4a9e-a32f-74731545d140" />
+
+---
+
+## What it does
+
+### Character tab
+- **Character selector** for selecting between either yourself (default) or any other NPC or friend(s) playing alongside you :)
+- Quick toggles:
+  - God Mode
+  - One Hit Kills
+  - Random Level Up
+  - Limit Break + Random Limit Break
+- Live editable values:
+  - Level, XP, Kills, Gold, Session Gold
+  - Max Weapons, Max Passives
+- Player stats editing:
+  - Max Health, Recovery, Armor, Move Speed
+  - Might, Projectile Speed, Duration, Area
+  - Cooldown, Amount
+  - Revivals left / used
+  - Magnet radius
+- Pickup mode popup:
+  - Normal
+  - Gems and Coins Only
+  - Gems, Coins and Roasts
+  - Gems, Coins, Roasts and Souls
+  - Ignore All
+
+Also shows per second deltas for levels, xp, kills and gold.
+
+### Music tab
+- Song list with:
+  - Search filter
+  - Tooltips for song credit(s)
+  - Auto scroll to the selected track when you enter the tab and when changing the song via the random option or previous/next buttons.
+- Controls:
+  - Stop Music
+  - Previous / Next
+  - Jump to a Random Track
+- Modifiers:
+  - Forsaken (slower and pitched down)
+  - Normal
+  - Hyper (faster and pitched up)
+
+### Engine tab
+- Camera zoom
+- Timescale control
+- SFX Volume + Music Volume
+- Survived time display/edit (shows formatted time, manual edit uses raw seconds as float)
+
+### Misc tab
+- Accent color picker that immediately re-applies the full theme
+- Log console: (for development but left it in anyways)
+  - Clear log
+  - Auto scroll
+  - Errors-only filter
+  - Search filter
+  - Click a log line to copy it to clipboard
+
+---
+
+## Build notes
+- **Language(s):** C++ (MASM available if needed)
+- **UI:** Dear ImGui
+- **Renderer:** DirectX 11
+- **Platform:** Windows
+
+To build this repo, install PolyHook2 via vcpkg (`polyhook2:x64-windows-static`), or replace the hooking layer with your own implementation.
+
+---
+
+## Safety, fairness, and common sense
+This is a runtime modding tool. You can absolutely break a run if you push values too far since I don't clamp most things!
+
+---
+
+## Roadmap (if i feel like it one day)
+- more Engine tab stuff as it's kinda bare compared to the rest of the tabs
+
+---
+
+## Credits
+- Dear ImGui
+- PolyHook2
+- Vampire Survivors (for being fun to play and poke at)