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/phones.md

@@ -0,0 +1,21 @@
+### phones.lua
+
+This module allows you to send in-game mail/messages to player phones, depending on the phone system integrated (e.g., QB, NPWD).
+
+- **sendPhoneMail(data)**
+
+  - Sends a mail message to a player's in-game phone app.
+  - Typically used to notify players about deliveries, missions, or reminders.
+  - **Parameters:**
+    - `data` (`table`): Must contain phone/mail system-compatible fields like `sender`, `subject`, `message`, and `receiver`.
+  - **Example:**
+    ```lua
+    sendPhoneMail({
+        subject = "Welcome!",
+        sender = "Admin",
+        message = "Thank you for joining our server.",
+        actions = {
+            { label = "Reply", action = replyFunction }
+        }
+    })
+    ```