arrays started: literals, size, splats, index access RW

docs/List.md

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+# List built-in class
+
+Mutable list of any objects.
+
+It's class in Ling is `List`:
+
+    [1,2,3]::class
+    >>> List
+
+you can use it's class to ensure type:
+
+    []::class == List
+    >>> true
+
+## Members
+
+| name    | meaning                       | type |
+|---------|-------------------------------|------|
+| `.size` | property returns current size | Int  |
+|         |                               |      |
+|         |                               |      |
+|         |                               |      |
+|         |                               |      |
+|         |                               |      |