Structure for console application docs

docs/guide/console.md

-Building console applications
-=============================
+Console applications
+====================
 
-TDB
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+Yii has full featured support of console. Console application structure in Yii is very similar to web application. It
+consists of one or more [[\yii\console\Controller]] (often referred to as commands). Each has one or more actions.
+
+Usage
+-----
+
+User executes controller action using the following syntax:
+
+```
+yii <route> [--param1=value1 --param2 ...]
+```
+
+For example, `MigrationController::create` with `MigrationController::$migrationTable` set can be called from command
+line like the following:
+
+```
+yii migreate/create --migrationTable=my_migration
+```
+
+Entry script
+------------
+
+
+Configuration
+-------------
+
+Creating your own console commands
+----------------------------------
+
+### Controller
+
+### Action
+
+### Parameters
+
+### Return codes
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