Update README.md

README.md

 # XtalkLisaPropagation
 
-Implementation of the spacecrafts jitters/accelerations (cross talk) in the TDI outputs
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+Implementation of tilt to length coupling noise (TTL) in LISA by
+spacecraft jittering cross talk in the TDI outputs in synthlisa.
+
+Synthlisa's TDInoise constructor had to be extended by a new noise:
+phase_meter_noise which was derived from optical (shot) noise
+
+We use Vagrant to provision a VirtualBox virtual LINUX machine as an ideal 
+environment for synthlisa. The changes regarding the above mentioned extension
+are done in the Git patch: extend-synthlisa-by-phasemeter-noise.patch
+
+please run the example in /testing and refer to the bootstrap.sh file for details