Add globals documentation page

docs/globals/index.md

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+---
+title: Globals
+description: Built-in globals.
+weight: 1
+---
+
+Globals are automatically available in every script and do not need to be referenced from another object.
+
+## Methods
+
+This section documents built-in non-standard functions.
+
+---
+
+### spawn(callback;function) { method }
+
+Executes a function asynchronously in a new thread.
+
+**Example**
+
+```lua
+spawn(function()
+    print("Hello, world!")
+end)
+```
+
+### tick(void):number { method }
+
+Returns how much time has passed in seconds since the Unix epoch.
+
+### wait(seconds;number):number { method }
+
+Yields the current thread for a duration.
+Returns the time waited.
+
+**Example**
+
+```lua
+print("foo")
+wait(1)
+print("bar")
+```
+
+<div data-search-exclude markdown>
+!!! note "Calling wait(0) still yields execution."
+</div>
+
+## Properties
+
+This section documents built-in non-standard properties.
+
+---
+
+### game:Game { property }
+
+Privdes access to the root game instance.
+
+### script:BaseScript { property }
+
+A reference to the current script instance.
+
+### \_VERSION:string { property }
+
+The current MoonSharp version.
+
+### \_MOONSHARP:table { property }
+
+A table of MoonSarp information.