Create manual-advance.md.

Author: CakeVR

documentation/manual-advance.md

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+<div class="header-banner purple">
+     <div class="header-label purple">Manual-Advance</div>
+</div>
+
+*Manual-Advance allows your player to advance the timeline by using input mapped to `dialogic_default_action` (Project Settings → Input Map).*
+
+## 📜 Content
+[toc]
+
+## 1. What is Manual-Advance?
+
+Manual-Advance is a feature in Dialogic that allows players to progress through the timeline *with* inputs! It's enabled by default: The player clicks, and the timeline moves down its stack of events.
+
+## 2. Changing Manual-Advance via Code
+
+Dialogic's Manual-Advance class can be easily accessed via the Inputs subsystem and allows you to change Manual-Advance during your game. It also has a number of settings not exposed to the dialogic interface.
+
+All of this functionality lives in `Dialogic.Inputs.Manual-Advance` an `DialogicManualAdvance` object.
+We can limit the player from interacting with the timeline to display a scripted timeline section.
+
+# 2.1 Limit Player Inputs via Code
+It's straightforward to script this behaviour. The following snippet showcases this:
+
+```gdscript
+Dialogic.Inputs.auto_advance.disabled_until_next_event = true
+```
+
+In Dialogic, both Manual-Advance and Auto-Advance share the concept of `system`: The system is the feature itself, in this case Manual-Advance. You can prevent players from advancing the timeline:
+
+```gdscript
+# No more inputs for you, player.
+Dialogic.Inputs.auto_advance.system_enabled = false
+```
+
+Additionally, you can call the method `Dialogic.Inputs.auto_advance.is_enabled()` to check if the player can manually advance.