message: Mention GLVis in INSTALL
diff: @@ -32,6 +32,9 @@ following package managers:
  - OpenHPC, http://openhpc.community
  - Homebrew/Science, https://github.com/Homebrew/homebrew-science
  +We also recommend downloading and building the MFEM-based GLVis visualization
  +tool which can be used to visualize the meshes and solution in MFEM's examples
  +and miniapps. See http://glvis.org and http://mfem.org/building.
  Quick start with GNU make
  =========================
  