added ctc_doc/readme.txt

.gitignore

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+!ctc_doc/readme.txt
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ctc_doc/readme.txt

+leverjs software fo cell tracking challenge 2021 second submission 
+primary and secondary tracks 
+layton aho, raymond yung and andrew r. cohen
+andrew.r.cohen@drexel.edu
+
+June, 2021
+
+NOTES
+
+- the uploaded executables have been modified to use Linux .sh files. the implementation is tested on Ubuntu 20.04. 
+
+prerequisites:
+
+- matlab 2019b mcr runtime is assumed to be installed in '/usr/local/MATLAB/MATLAB_Runtime/v97'. if this is not the correct path,
+the .sh files will need to be modified easily with the correct path or possibly a softlink could be added.
+
+the runtime is available here:
+
+https://ssd.mathworks.com/supportfiles/downloads/R2019b/Release/8/deployment_files/installer/complete/glnxa64/MATLAB_Runtime_R2019b_Update_8_glnxa64.zip
+
+
+- mpich is required: 'sudo apt install mpich'
+
+
+performance notes:
+
+- running any batch script for the first time will cause *all* of the movies to be imported to the LEVER format and denoised. this is going to
+be quite slow, but it will only happen once.