Update README.md

Author: dfyockey

README.md

@@ -2,7 +2,7 @@
 Utility for retrieving favicons and other site-related icons for a given URL
 
 ## Description
-The purpose of _ficonic_ is to download all icons intended for use in identifying a site at a given URL. This allows the user to select the icon best suited for the medium through which they intend to identify the site.
+The immediate purpose of _ficonic_ is to enable download of all icons provided for identifying a site at a given URL. This allows the user to select the icon best suited for the medium through which they intend to identify the site. The longer term goal is to provide a library for loading data for all of the aforementioned icons into a C++ application for manipulation and/or use as needed.
 
 _ficonic_ downloads `favicon.ico` and `apple-touch-icon.png` files where found in the site's root directory and any icons identified in HTML `link` tags having recognized `rel` values.
 
@@ -21,7 +21,14 @@ The following libraries are required:
 * htmlcxx
 
 ## To Do
+_(in no particular order...)_
 * Handle HTML `meta` tags referring to Microsoft tiles.
 * Handle Progressive Web App manifests referring to icons.
 * Resolve build warnings about `MAGICKCORE_QUANTUM_DEPTH` and `MAGICKCORE_HDRI_ENABLE`.
-* Enable use of `$HOME` and `~` to refer to the home directory in specifying the icon storage directory path.
+* Enable use of `$HOME` and `~` to refer to the home directory in specifying the icon storage directory path.
+* Add user-friendly error messages for missing required arguments.
+* Update help information to indicate what arguments are required.
+* Clean up console output to improve usability.
+* Handle `.gif` icon files.
+* Add error handling to skip unsupported file types.
+* Create and save icons to a different directory for each URL from which icons are retrieved.