support running single ctest

Author: xylian86

core/run_ctest/README.md

@@ -25,8 +25,7 @@ p_input = {
 "maven_args": ["-DfailIfNoTests=false"]
 ```
 
-*If you want to run a single ctest, change the "run_mode" in program_input.py to "run_single_ctest" 
-
+*Second*, run `./run_ctest.sh`. Each correctly formatted configuration file in the `conf_file_dir` folder will be tested sequentially.
 
 ### Result