doc: add sample package file tree

doc/std/init.im

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+package std

doc/std/io/StreamReader.im

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+package std.io
+
+protocol StreamReader
+    - get:buf
+end

doc/std/io/StreamWriter.im

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+package std.io
+
+protocol StreamWriter
+    - flush
+    - print:msg
+    - put:msg
+end

doc/std/io/init.im

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+package std.io
+
+cin = StreamReader new
+cout = StreamWriter new
+cerr = StreamWriter new

doc/std/lang/Bool.im

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+package std.lang
+
+protocol Bool
+    - if:
+    - if:else:

doc/std/lang/Int.im

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+package std.lang
+
+protocol Int
+    + parse:
+    - to:
+    - to:step:
+    - to:step:do:
+end

doc/std/lang/Iterator.im

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+package std.lang
+
+protocol Iterator
+    - value
+    - moveNext
+    - select:
+    - select:collect:
+    - iterator
+end

doc/std/lang/Lambda.im

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+package std.lang
+
+protocol Lambda
+    - argCount
+    - call
+    - call:
+    - call(_:_:)
+    - call(_:_:_:)
+    - call(_:_:_:_:)
+    - call(args:)
+    - on:do:
+    - if:
+    - unless:
+end

doc/std/lang/Object.im

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+package std.lang
+
+protocol Object
+    - is:
+    - implements:
+    - respondsTo:
+    - doesNotUnderstand(selector:args:)
+    - sendMsg(selector:args:)
+    - toString
+end

doc/std/lang/Package.im

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+package std.lang
+
+protocol Package
+    - size
+    - iterator
+    - exists:
+    - put:at:
+    - get:
+    - map:
+    - select:
+    - select:collect:
+end

doc/std/lang/Selector.im

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+package std.lang
+
+protocol Selector
+    + parse
+end

doc/std/lang/String.im

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+package std.lang
+
+protocol String
+    - size
+    - uppercase
+    - lowercase
+    - append:
+    - prepend:
+    - at:insert:
+    - contains:
+    - iterator
+end