add existing documentation

doc/standard-library.txt

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+
+*** PACKAGES ******************************************************************
+
+ ## std.lang #####
+  This package contains all of the "built-in" classes, such as String,
+  Package, etc.
+
+  This package is always included by default for all Ivy source files, so
+  there is no need to include a `use std.lang` statement.
+
+
+ ## std.io #####
+  This package includes classes for performing IO operations, including
+  reading/writing to the terminals, files, etc.
+
+  This package also includes the cin, cout, and cerr objects that point
+  to standard in, standard out, and standard error respectively.
+
+  
+*** CLASSES *******************************************************************
+
+//// std.lang ////
+
+ ## Object #####
+  -is:
+    -implements:
+    -respondsTo:
+    -doesNotUnderstand(selector:args:)
+    -sendMsg(selector:args:)
+    -toString
+
+ ## Int #####
+    +parse:
+    -to:
+    -to:step:
+    -to:step:do:
+
+ ## Enum #####
+    **
+
+ ## String #####
+    -size
+    -uppercase
+    -lowercase
+    -append:
+    -prepend:
+    -at:insert:
+    -contains:
+    -iterator
+
+ ## Bool #####
+    -if:
+    -if:else:
+
+ ## Package #####
+  -size
+    -exists:
+    -at:put:
+    -at:
+    -map:
+    -select:
+    -select:collect:
+    -iterator
+
+ ## Iterator #####
+    -value
+    -moveNext
+    -select:
+    -select:collect:
+    -iterator
+
+ ## Lambda #####
+  -argCount
+  -call
+  -call:
+    -call(_:_:)
+    -call(_:_:_:)
+    -call(_:_:_:_:)
+    -call(args:)
+  -on:do:
+    -if:
+    -unless:
+
+ ## Selector #####
+    +parse:
+
+ ## Error #####
+  -msg
+  -data
+  -withMsg:andData: