Make migration guide

docs/_sidebar.md

@@ -10,3 +10,5 @@
         - [🗃 AvailableQuestPool](/api/quest_pool/available_quest_pool.md "🗃 AvailableQuestPool") 
         - [🗃 ActiveQuestPool](/api/quest_pool/active_quest_pool.md "🗃 ActiveQuestPool") 
         - [🗃 CompletedQuestPool](/api/quest_pool/completed_quest_pool.md "🗃 CompletedQuestPool") 
+- [📨 Migrations](/)
+  - [🔸 1.2.3 to 1.3+](migrate_1.2.3_to_1.3.md)

docs/migrate_1.2.3_to_1.3.md

@@ -0,0 +1,40 @@
+# Migrate from v.1.2.3 to 1.3 and up
+
+In version [1.3]() some minor breaking changes happened: quest methods now accepts optional arguments.<br>
+This change has led to old quest scripts to break.<br>
+Here's how to fix all the errors you may encounter 
+## QUEST RESOURCE
+
+If you encounter a Parse error when updating:
+
+```diff
+- Parser Error: The function signature doesn't match the parent. Parent signature is "start(Dictionary = <default>) -> void".
+```
+![Parse Error](assets/migrations/1.2.3-to-1.3.png)
+
+Change all your quest scripts, making the following changes:
+
+```gdscript
+# script that inherits from Quest
+
+BEFORE
+func start() -> void:
+    ...
+
+func update() -> void:
+    ...
+
+func complete() -> void:
+    ...
+
+
+AFTER
+func start(_args: Dictionary = {}) -> void:
+	...
+
+func update(_args: Dictionary = {}) -> void:
+	...
+
+func complete(_args: Dictionary = {}) -> void:
+	...
+```