Added explanations to the workflow.

Author: serbanghita

packages/glhf-fsm/README.md

@@ -0,0 +1,40 @@
+# Finite State Machine
+> Finite State Machine that supports registering custom states, state priority and queued states.
+> This is a package part of the glhf.js library but can be used independently.
+
+
+## Usage
+
+**Registering states**
+
+```typescript
+import StateManager from "./StateManager";
+
+const sm = new StateManager();
+sm.registerState(new IdleState('idle', 99, true)); // default state.
+sm.registerState(new IdleState('attack', 1));
+sm.registerState(new IdleState('walk', 2));
+
+sm.update();
+```
+
+Registered states have to extend the class `State` where you can implement your custom actions by extending the methods:
+
+```
+    enter(...args: any[]);
+    exit()
+    update()
+```
+
+**Triggering a State**
+
+```typescript
+sm.triggerState('attack', ...params);
+```
+
+**Queueing states**
+
+```typescript
+sm.queueState('tell_story_a', ...params);
+sm.queueState('smoke_a_cigar', ...params);
+```