Update README.md with basic intro and bumped HDF5 version

README.md

@@ -1,38 +1,49 @@
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.1133781.svg)](https://doi.org/10.5281/zenodo.1133781)
 [![Build Status](https://github.com/drsteve/LANLGeoMag/actions/workflows/lgm-ci.yml/badge.svg)](https://github.com/drsteve/LANLGeoMag/actions/workflows/lgm-ci.yml)
 
-
-Build instructions for Linux are in INSTALL, which is generated by automake.
-Also see ./configure --help for some useful options. Additional information 
-can be found in the HACKING file, including hints for Mac users and 
-instructions for recent HDF5 library updates. Guidance for contributors can
-be found in WORKFLOW.md.
+Getting Started with LANLGeoMag
+===============================
+Clone or download from https://github.com/drsteve/LANLGeoMag
+
+If everything is set up correctly:
+```
+autoreconf -i
+./configure
+make -j
+make install
+```
+
+Also see `./configure --help` for options at configure time, and
+additional helpful information can be found in the `HACKING` file.
+Autogenerated instructions for Linux are given in `INSTALL`, which
+is generated by automake when `autoreconf -i` is run.
+Guidance for contributors can be found in WORKFLOW.md.
 
 Dependencies are:
 
 perl
-====
-LanlGeoMag links against libperl, so you need perl development headers.
+----
+OPTIONAL: LanlGeoMag optionally links against libperl, so you may need perl development headers.
 Ubuntu package: libperl-dev
 
 GNU Scientific Library
-======================
+----------------------
 Again, the development package is required.
 Ubuntu packge: libgsl0-dev
 
-HDF5 1.8
-========
-Must be version 1.8 or later. Development package required.
+HDF5 1.10
+---------
+Must be version 1.10 or later. Development package required.
 Ubuntu package: any package that provides libhdf5-dev. libhdf5-serial-dev is suggested.
 
 GNU Autoconf, Automake and Libtool
-==================================
+----------------------------------
 LanlGeoMag uses GNU autotools to build the configure scripts and makefiles.
 On GNU systems these are provided with the operating system. On Mac these were 
 provided with XCode prior to version 4.3 (Shipped with OS X).
 Mac install: (MacPorts) sudo port --verbose install autoconf automake libtool
 
 GNU argp
-========
+--------
 On non-GNU systems argp must be installed prior to building LanlGeoMag.
 Mac package: argp-standalone (known to be provided by MacPorts and HomeBrew)