Add bl2speed.md for sprint speed modification

_willow2_mods/bl2speed.md

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+---
+pyproject_url: https://raw.githubusercontent.com/NKAYE0/BL2speed/main/bl2speed/pyproject.toml
+---
+
+Makes sprinting faster, leaving normal walking speed untouched.
+
+Adds a single option, **Sprint Speed**, with choices from `1x` up to `10x`. The
+number is how fast you sprint compared to a normal sprint, so `2x` means you
+cover ground twice as quickly as vanilla sprinting does. `1x` is the game's own
+speed, so the mod can be left enabled with no effect. The default is `1.5x`.
+
+The multipliers are true multiples of vanilla sprint speed rather than raw
+internal values — the mod reads the game's own sprint definition at runtime and
+solves for the value that produces the requested speed, so `2x` really is twice
+as fast.
+
+### Notes
+
+- Walking, crouching and vehicle speeds are unchanged. Only sprinting is
+  affected, and disabling the mod restores the game's own value exactly.
+- **Coop is untested.** The mod only edits your own game's sprint definition
+  and touches no networking code, so it shouldn't affect anyone else — but BL2
+  corrects player movement against the host, and I haven't tested whether a
+  faster sprint gets corrected. Expect the possibility of rubber-banding,
+  especially at high multipliers. Reports welcome.
+- Air control is deliberately untouched, so momentum behaves exactly as vanilla
+  once you leave the ground. At `3x` and above you will overshoot ledges and
+  jumps you're used to.