better documentation layout

- seperated the 2000+ lines in ReadMe.md into seperate files.
 - useful if things expand
 - better readability for users
 - more organised layout

documentation/main_functions/shops.md

@@ -0,0 +1,63 @@
+### shops.lua
+
+This module provides functions to open, sell to, and register in-game shops and markets.
+
+- **sellMenu(data)**
+
+  - Opens a UI menu for selling items to a vendor or market system.
+  - A simple system for the ability to sell all of an item in a players inventory
+  - Good for money making eg. pawn shops
+  - **Example:**
+    ```lua
+    sellMenu({
+        sellTable = {
+            Header = "Sell Items",
+            Items = {
+                ["gold_ring"] = 100,
+                ["diamond"] = 500,
+            },
+        },
+        ped = pedEntity,
+        onBack = function() print("Returning to previous menu") end,
+    })
+    ```
+
+- **sellAnim(data)**
+
+  - Plays an animation during the selling process for immersion.
+  - Used in sellMenu, but can be called externally if needed
+  - **Example:**
+    ```lua
+    sellAnim({
+       item = "gold_ring",
+       price = 100,
+       ped = pedEntity,
+       onBack = function() print("Sold Items") end,
+    )
+    ```
+
+- **openShop(data)**
+
+  - Opens a shop interface for purchasing items.
+  - Checks job/gang restrictions, then uses the active inventory system to open the shop.
+  - **Example:**
+    ```lua
+    openShop({
+        shop = "weapon_shop",
+        items = weaponShopItems,
+        coords = vector3(100.0, 200.0, 300.0),
+        job = "police",
+    })
+    ```
+
+- **registerShop(name, label, items, society)**
+
+  - Registers a named shop with associated items and an optional society for fund handling.
+  - Supports either OXInv or QBInv (with QBInvNew flag).
+  - **Example:**
+    ```lua
+    registerShop("fishing_shop", "Bait & Tackle", {
+        { item = "fishing_rod", price = 50 },
+        { item = "bait", price = 5 }
+    }, "fishing_society")
+    ```