add character to clientstate and add sprint system

src/ReplicatedStorage/ecs/systems/client/sprint.ts

@@ -0,0 +1,34 @@
+import { World } from "@rbxts/matter"
+import { match } from "@rbxts/variant"
+import { clientState } from "ReplicatedStorage/ecs/state"
+
+function sprint(_: World, client: clientState): void {
+	if (client.lastProcessedCommand !== undefined) {
+        match(client.lastProcessedCommand, {
+            KeyDown: ({ key }) => {
+                if (key === Enum.KeyCode.LeftControl) {
+                    client.isRunning = true
+                }
+            },
+            KeyUp: ({ key }) => {
+                if (key === Enum.KeyCode.LeftControl) {
+                    client.isRunning = false
+                }
+            },
+            default: () => {
+                // do nothing
+            }
+        })
+    }
+
+    if (client.isRunning && client.character) {
+        client.character.Humanoid.WalkSpeed = 24
+        return
+    }
+
+    if (client.character) {
+        client.character.Humanoid.WalkSpeed = 16
+    }
+}
+
+export = sprint