add info about clang-format to contributing docs Change-Id: I2f4dcbda2e4f36096df217d76de370103ffaa43e
Ceres Solver is an open source C++ library for modeling and solving large, complicated optimization problems. It is a feature rich, mature and performant library which has been used in production at Google since 2010. Ceres Solver can solve two kinds of problems.
Please see ceres-solver.org for more information.