Add LambertSolver.cs.
Merge pull request #1 from alexmoon/master

Addition of Alex's Lambert Solver code
tweaking readme
Fix coordinate system conventions.
Mucking with Transfer Values
Fixed a critical bug in LambertSolver.FindRoot(); implemented orbit position and velocity methods to provide a thread-safe and fixed frame of reference; fixed a few other minor bugs and made general improvements to the algorithms.
Working on Worker
Merge pull request #2 from alexmoon/master

Updates to the LambertSolver
WIP-Tidied up some stuff to do an initial commit - NOT IN A WORKING STATE
Merging develop