Create a simple dialogue authoring system, tied into our items (#10)

- Editor dialogue graph
- Asset importer for processing the graph into runtime data
- DialogueComponent that steers the dialogue interactions
- DialogueCanbas with a scalable speech bubble to display everything
- Brief README overview of the system

Co-authored-by: AlexanderT <alexander@foolhardyhorizons.com>
Co-authored-by: Michal Pikulski <michal.a.pikulski@gmail.com>
Reviewed-on: #10

Assets/Scripts/Dialogue/RuntimeDialogueGraph.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Dialogue
+{
+    [Serializable]
+    public enum RuntimeDialogueNodeType
+    {
+        Dialogue,
+        WaitOnPuzzleStep,
+        WaitOnPickup,
+        WaitOnSlot,
+        WaitOnCombination,
+        End
+    }
+
+    [Serializable]
+    public class RuntimeDialogueGraph : ScriptableObject
+    {
+        public string entryNodeID;
+        public string speakerName;
+        public List<RuntimeDialogueNode> allNodes = new List<RuntimeDialogueNode>();
+
+        // Helper method to find a node by ID
+        public RuntimeDialogueNode GetNodeByID(string id)
+        {
+            return allNodes.Find(n => n.nodeID == id);
+        }
+    }
+
+    [Serializable]
+    public class RuntimeDialogueNode
+    {
+        public string nodeID;
+        public RuntimeDialogueNodeType nodeType;
+        public string nextNodeID;
+        
+        // Basic dialogue
+        public List<string> dialogueLines = new List<string>();
+        public bool loopThroughLines;
+        
+        // Conditional nodes
+        public string puzzleStepID; // For WaitOnPuzzleStep
+        public string pickupItemID;  // For WaitOnPickup
+        public string slotItemID;    // For WaitOnSlot
+        public string combinationResultItemID; // For WaitOnCombination
+        
+        // For WaitOnSlot - different responses
+        public List<string> incorrectItemLines = new List<string>();
+        public bool loopThroughIncorrectLines;
+        public List<string> forbiddenItemLines = new List<string>();
+        public bool loopThroughForbiddenLines;
+    }
+}