Graft pcb-tools upstream onto gerbonara tree

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+About PCB Tools
+===============
+
+
+PCB Tools provides a set of utilities for visualizing and working with PCB
+design files in a variety of formats. The design files are generally referred
+to as Gerber files. This is a generic term that may refer to
+`RS-274X (Gerber) <http://en.wikipedia.org/wiki/Gerber_format>`_,
+`ODB++ <http://en.wikipedia.org/wiki/ODB%2B%2B>`_ ,
+or `Excellon <http://en.wikipedia.org/wiki/Excellon_format>`_ files. These
+file formats are used by the CNC equipment used to manufacutre PCBs.
+
+PCB Tools currently supports the following file formats:
+
+- Gerber (RS-274X)
+- Excellon
+
+with planned support for IPC-2581, ODB++ and more.
+
+Image Rendering
+~~~~~~~~~~~~~~~
+.. image:: ../../examples/cairo_example.png
+   :alt: Rendering Example
+
+The PCB Tools module provides tools to visualize PCBs and export images in a
+variety of formats, including SVG and PNG.
+
+
+
+
+Future Plans
+~~~~~~~~~~~~
+We are working on adding the following features to PCB Tools:
+
+- Design Rules Checking
+- Editing
+- Panelization
+
+
+