Create a basic readme

ReadMe.md

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+## Source Tool Assist
+
+Plugin for tool assisted runs in CSS. Supports stitching a run together with rewind or tick by tick advancement. With replays on a bot and allows editing of that bot in spectator. Includes zones and tick timer.
+
+### Commands
+
+- **sm_segmentreplay** - Open main plugin menu. 
+- **sm_zone_edit** - Open zone edit menu.
+- **sm_stepback** - Step back a single tick in edit mode.
+- **sm_stepforward** - Step forward a single tick in edit mode.
+- **+sm_rewind** - Start rewinding with speed factor in edit mode.
+- **+sm_fastforward** - Fast forward with speed factor in edit mode.
+- **sm_zone_gridsize** - Parameter which to snap zone creation points to.
+- **sm_respawn** - Respawns the player if they are dead.