Added multitask example

examples/multitask.equi

@@ -0,0 +1,28 @@
+(A very simple example to showcase multitasking capabilities of Equi)
+(by Luxferre, 2022, public domain)
+
+(save cmd buffer start to ease calculations)
+X1-GS
+
+(define a task multiplexer to run the second task)
+0026#GL+6#0Y!
+
+(and the third task)
+002D#GL+6#0Y!
+
+(while we define the third task, the second is already running,
+so some B's will be output even before A's,
+and when the third task will be defined, one C will be output)
+
+(define task 0 - output A in endless loop)
+A"$.5NJ
+
+(define task 1 - output B in endless loop)
+B"$.5NJ
+
+(define task 2- output C in endless loop)
+C"$.5NJ
+
+(and now, ABC pattern should print continuously)
+
+Q