merge libmaple docs ("leaflabs-docs") into ./docs

In the past, libample documentation was forked out of this repository
because the documentation had increased in scope. For the librambutan,
and the rambutan project in general, we will try to keep documentation
closer to the source code, so the librambutan-specific documentation
should live here. Other sections of leaflabs-docs will be culled in a
following commit.

This merge attempts to maintain history by using a subtree strategy.
Followed directions at:

    http://nuclearsquid.com/writings/subtree-merging-and-you/

Full history for files should be accessible using the "--follow" flag to
git log, eg:

    git log --follow docs/source/adc.rst

It should be possible to pull patches from leaflabs-docs with:

    git pull -s subtree leaflabs-docs master

... at least until the docs in this repository diverge significantly.

1 files changed, 70 insertions, 0 deletions

diff --git a/docs/source/lang/cpp/include.rst b/docs/source/lang/cpp/include.rst
new file mode 100644
index 0000000..163509d
--- /dev/null
+++ b/docs/source/lang/cpp/include.rst
@@ -0,0 +1,70 @@
+.. highlight:: cpp
+
+.. _lang-include:
+
+``#include``
+============
+
+``#include`` is used to include outside libraries in your sketch.
+This gives the programmer access to a large group of standard C
+libraries (groups of pre-made functions and data types), and also
+libraries written especially for Maple.
+
+Example
+-------
+
+This example (from the `Arduino LiquidCrystal Tutorial
+<http://arduino.cc/en/Tutorial/LiquidCrystal>`_) includes a library
+that is used to control :ref:`LCD displays
+<libraries-liquid-crystal>`::
+
+    // include the library code:
+    #include <LiquidCrystal.h>
+
+    // initialize the library with the numbers of the interface pins
+    LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
+
+    void setup() {
+      // set up the LCD's number of columns and rows:
+      lcd.begin(16, 2);
+      // Print a message to the LCD.
+      lcd.print("hello, world!");
+    }
+
+    void loop() {
+      // set the cursor to column 0, line 1
+      // (note: line 1 is the second row, since counting begins with 0):
+      lcd.setCursor(0, 1);
+      // print the number of seconds since reset:
+      lcd.print(millis()/1000);
+    }
+
+Note that a ``#include`` line, like :ref:`#define <lang-define>`,
+has **no semicolon**.  The compiler will print strange error messages
+if you add one.
+
+C Standard Library
+------------------
+
+The standard C library that comes with Maple is called `newlib
+<http://sourceware.org/newlib/>`_.  Its main sources of documentation
+are its `main reference <http://sourceware.org/newlib/libc.html>`_
+page and its `math functions
+<http://sourceware.org/newlib/libm.html>`_ reference page.  Here's an
+example that imports the math.h library in order to take the `cube
+root <http://en.wikipedia.org/wiki/Cube_root>`_ of a number::
+
+    #include <math.h>
+
+    void setup() {
+        // no setup necessary
+    }
+
+    void loop() {
+        // "cbrt" stands for "cube root"
+        double cubeRootOf3 = cbrt(3.0);
+        // prints a number that is approximately the cube root of 3:
+        SerialUSB.println(cubeRootOf3);
+    }
+
+.. include:: /arduino-cc-attribution.txt