add build infrastructure

.gitignore

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+/.rsconscache
+/app

Rakefile.rb

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+require "rscons"
+
+task :default do
+  Rscons::Environment.new do |env|
+    env.build_root = "build"
+    env["CXXFLAGS"] += %w[-isystem oglplus/include]
+    env["CPPDEFINES"] += %w[
+      OGLPLUS_NO_SITE_CONFIG
+    ]
+    sources = Dir["*.cc"]
+    env.Program("app", sources)
+  end
+end