Move build instructions to README.md

docs/build.md

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-# Building PDFium
-
-## Prerequisites
-
-Get the chromium depot tools via the instructions at
-http://www.chromium.org/developers/how-tos/install-depot-tools (this provides
-the gclient utilty needed below).
-
-Also install Python, Subversion, and Git and make sure they're in your path.
-
-Optionally, you may want to install the [Ninja](http://martine.github.io/ninja/)
-build system (recommended) rather than using your platform-specific build
-system.
-
-## Get the code
-
-```
-mkdir pdfium
-cd pdfium
-gclient config --name . --unmanaged https://pdfium.googlesource.com/pdfium.git
-gclient sync
-```
-
-## Generate the build files
-
-Now we use the GYP library to generate the build files.
-
-At this point, you have two options. The first option is to use the [Ninja]
-(http://martine.github.io/ninja/) build system. This is the default as of
-mid-September, 2015. Previously, the second option was the default. Most PDFium
-developers use Ninja, as does our [continuous build system]
-(http://build.chromium.org/p/client.pdfium/).
-
-On Windows: `build\gyp_pdfium
-` For all other platforms: `build/gyp_pdfium
-`
-
-The second option is to generate platform-specific build files, i.e. Makefiles
-on Linux, sln files on Windows, and xcodeproj files on Mac. To do so, set the
-GYP\_GENERATORS environment variable appropriately (e.g. "make", "msvs", or
-"xcode") before running the above command.
-
-## Building the code
-
-If you used Ninja, you can build the sample program by: `ninja -C out/Debug
-pdfium_test
-` You can build the entire product (which includes a few unit tests) by: `ninja
--C out/Debug
-`
-
-If you're not using Ninja, then building is platform-specific.
-
-On Linux: `make pdfium_test
-`
-
-On Mac, open build/all.xcodeproj
-
-On Windows, open build\all.sln
-
-## Running the sample program
-
-The pdfium\_test program supports reading, parsing, and rasterizing the pages of
-a .pdf file to .ppm output image files (windows supports two other formats, and
-.png support is available for all platforms in an alternate branch (see branches
-section below)). For example: `out/Debug/pdfium_test --ppm path/to/myfile.pdf
-`
-
-## Waterfall
-
-The current health of the source tree can be found at
-http://build.chromium.org/p/client.pdfium/console
-
-## Branches
-
-There is a branch for a forthcoming feature called XFA that you can get by
-following the steps above, then: `git checkout origin/xfa build/gyp_pdfium ninja
--C out/Debug
-`
-
-The XFA version of the sample pdfium\_test program supports rasterizing to .png
-format files. For example: `out/Debug/pdfium_test --png path/to/myfile.pdf
-`