Add Actions and Tasks documentation

doc/actions_and_tasks.txt

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+Actions and Tasks
+Advanced_NPC Alpha-2 (DEV)
+==========================
+
+IMPORTANT: In this documentation is only the explanation of the particular operation of each predefined 
+action and task. Read reference documentation for details about API operation at `API.txt`.
+
+Action (`add_action`)
+---------------------
+
+* `SET_INTERVAL` : Set the interval at which the `action` are executed.
+    args = {
+        interval = 1, -- A decimal number, in seconds (default is 1 second)
+        freeze = false, -- if true, mobs_redo API will not execute until interval is set
+    }
+
+* `FREEZE` : This action allows to stop/execute mobs_redo API. 
+  This is good for stopping the NPC from fighting, wandering, etc.
+    Arguments table definition
+    {
+        freeze = false, -- Boolean, if true, mobs_redo API will not execute.
+    }
+
+Tasks (`add_task`)
+------------------
+
+* `USE_BED` : Sequence of actions that allows the NPC to use a bed.
+    Arguments table definition
+    {
+        pos = {x=0,y=0,z=0}, -- Position of bed to be used.
+        action = action, --[[ 
+            ^ Whether to get up or lay on bed
+            ^ Defined in npc.actions.const.beds.action
+            ^ Example: npc.actions.const.beds.action.LAY ]]
+    }