added link to run tests and made the shell script work when called from any directory.

run_tests

@@ -0,0 +1 @@
+./src/tests/run_tests.sh

src/tests/run_tests.sh

@@ -1 +1,9 @@
+SOURCE="${BASH_SOURCE[0]}"
+while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
+  DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+  SOURCE="$(readlink "$SOURCE")"
+  [[ $SOURCE != /* ]] && SOURCE="$DIR/$SOURCE" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
+done
+DIR="$( cd -P "$( dirname "$SOURCE" )" && pwd )"
+cd $DIR
 python -m unittest -v audiofile_tests