initial upload

test/old_tests/inversion_ASCII/README.md

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+# Inversion test 
+
+This is a test setup for inversion calculation.
+
+1. Run all cells of `make_test_model.ipynb` for creating
+    - source, receiver file
+    - true model
+    - initial model
+
+2. then run TOMOATT forward with `input_params_pre.yml` for calculating the true arrival times at the stations
+-> this will output src_rec_result.dat file which includes the arrival time at each station
+
+3. run TOMOATT in inversion mode with `input_params.yml`.
+