Create console-scripting.md [ci skip]

Documentation/console-scripting.md

@@ -0,0 +1,68 @@
+## Console variables
+
+Console variables (or CVars) are present in all quake-based games.
+
+By default, it is settings, created by engine, server or client libraries.
+
+But you can use `set` command to define variables even if they are not created by the engine.
+
+For example, you can set cvar before it is registered in code.
+
+`set defaultmap crossfire`
+
+This works even in server.cfg before server cvars initialization and the engine will reuse its value on cvar creation
+
+## Aliases
+
+An alias allows to define new commands.
+
+`alias wnext "invnext;wait;wait;+attack;wait;-attack"`
+
+You can hook any command by adding an alias to it and unaliasing it, when you want to use original command.
+
+```
+alias invnext1 "unalias invnext;wnext;alias invnext invnext1"
+alias invnext invnext1
+```
+
+## Scripting extensions
+
+This is an extensions of Xash3D FWGS(merged to original Xash3D since build 3887), that can be enabled by cmd_scripting cvar.
+
+Enabling scripting: `cmd_scripting 1`
+
+This is an archive cvar and it will be saved.
+
+### CVar substitution
+
+You can substitute cvar value to any command by adding \$ symbol:
+
+`echo $sv_cheats`
+
+### Condition checking
+
+Allows checking cvar values.
+
+```
+if <value1> <operator> <value2>
+:<action1>
+:if <value3>
+::<action2>
+:<action3>
+else
+:<action4>
+```
+
+* Values are any string or numeric values (for example, substituted cvars).
+* Operator is = (or ==), \!=, \<, \>, \<=, \>=. == is same to =.
+* If single value specified, condition is true when value is non-zero
+
+Example:
+
+```
+if $sv_cheats == 1
+:echo Cheats enabled, adding cheat menu
+:exec cheatmenu.cfg
+else
+:echo Please enable cheats to use this!
+```