Create extended_options.md (#95)

Author: juso40

_willow1_mods/extended_options.md

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+---
+pyproject_url: https://raw.githubusercontent.com/juso40/bl1sdk-mods/refs/heads/main/extended_options/pyproject.toml
+---
+Adds various new options and keybinds.
+
+#### Fixes Mouse Scrolling in Pause Menus
+
+## Options
+- FPS Slider
+- Mouse Smoothing
+- Window Mode
+- Outlines Post Processing
+- Crosshair Size
+
+## Keybinds
+- Drop Equipped Weapon