Add an initial README.md

README.md

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+Blueprint Build System
+======================
+
+Blueprint is a meta-build system that reads in Blueprints files that describe
+modules that need to be built, and produces a Ninja
+(http://martine.github.io/ninja/) manifest describing the commands that need to
+be run and their dependencies.  Where most build systems use built-in rules or
+a domain-specific langauge to describe the logic for converting module
+descriptions to build rules, Blueprint delegates this to per-project build
+logic written in Go.  For large, heterogenous projects this allows the inherent
+complexity of the build logic to be maintained in a high-level language, while
+still allowing simple changes to individual modules by modifying easy to
+understand Blueprints files.