expand on help flags

README.md

@@ -3,3 +3,15 @@
 This is a set of convenience scripts and `gdb` and `valgrind` configuration files
 meant to make running GENIE more pleasant. There are also some "notes to self"
 files containing frequently used commands, etc.
+
+The main scripts are:
+
+* `do_a_run.sh`: Run `gevgen` with a variety of flags and arguments (including
+`--gdb`).
+* `do_ghep_conversion.sh`: Convert GHEP record files to GSTs (and optionally to
+ROOTracker format also).
+* `do_make_spline.sh`: Run `gmkspl` with a variety of flags and arguments
+(including `--gdb`).
+
+Run any script with no arguments to get a help menu. `do_a_run.sh` and
+`do_make_spline.sh` also support explicit help flags (`-h` or `--help`).