Add Teensy HID USB mouse example

examples/teensy/teensy-hid-usb-mouse/README.rst

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+How to build PlatformIO based project
+=====================================
+
+1. `Install PlatformIO <http://docs.platformio.org/en/latest/installation.html>`_
+2. Download `source code with examples <https://github.com/platformio/platformio/archive/develop.zip>`_
+3. Extract ZIP archive
+4. Run these commands:
+
+.. code-block:: bash
+
+    # Change directory to example
+    > cd platformio-develop/examples/teensy/teensy-hid-usb-mouse
+
+    # Process example project
+    > platformio run
+
+    # Upload firmware
+    > platformio run --target upload
+
+    # Clean build files
+    > platformio run --target clean

examples/teensy/teensy-hid-usb-mouse/platformio.ini

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+#
+# Project Configuration File
+#
+# A detailed documentation with the EXAMPLES is located here:
+# http://docs.platformio.org/en/latest/projectconf.html
+#
+
+# A sign `#` at the beginning of the line indicates a comment
+# Comment lines are ignored.
+
+# Simple and base environment
+# [env:mybaseenv]
+# platform = %INSTALLED_PLATFORM_NAME_HERE%
+# framework =
+# board =
+#
+# Automatic targets - enable auto-uploading
+# targets = upload
+
+[env:teensy31]
+platform = teensy
+framework = arduino
+board = teensy31
+build_flags = -DTEENSY31 -UUSB_SERIAL -DUSB_SERIAL_HID

examples/teensy/teensy-hid-usb-mouse/src/TriangleMove.ino

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+/* Simple USB Mouse Example
+   Teensy becomes a USB mouse and moves the cursor in a triangle
+
+   You must select Mouse from the "Tools > USB Type" menu
+
+   This example code is in the public domain.
+*/
+
+void setup() { } // no setup needed
+void loop() {
+  int i;
+  for (i=0; i<40; i++) {
+    Mouse.move(2, -1);
+    delay(25);
+  }
+  for (i=0; i<40; i++) {
+    Mouse.move(2, 2);
+    delay(25);
+  }
+  for (i=0; i<40; i++) {
+    Mouse.move(-4, -1);
+    delay(25);
+  }
+}