Initial commit. The library includes a simple Builder, a Semigroup instance, primitives for running the builder, and a function for decimal-encoding a 64-bit word. There is also a test suite to confirm that it works.

.gitignore

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+dist
+dist-*
+cabal-dev
+*.o
+*.hi
+*.chi
+*.chs.h
+*.dyn_o
+*.dyn_hi
+.hpc
+.hsenv
+.cabal-sandbox/
+cabal.sandbox.config
+*.prof
+*.aux
+*.hp
+*.eventlog
+.stack-work/
+cabal.project.local
+cabal.project.local~
+.HTF/
+.ghc.environment.*
+stack.yaml
+*.swm
+*.swo
+*.swp
+test_results/**