Improve README

README.md

@@ -1,24 +1,30 @@
 rebar3_sbom
-=====
+===========
 
 Generates a Software Bill-of-Materials (SBoM) in CycloneDX format
 
-Build
------
-
-    $ rebar3 compile
-
 Use
 ---
 
-Add the plugin to your rebar config, either in a project or globally in
+Add rebar3_sbom to your rebar config, either in a project or globally in
 ~/.config/rebar3/rebar.config:
 
     {plugins, [rebar3_sbom]}.
 
-Then just call your plugin directly in an existing application:
-
+Then run the 'sbom' task on a project:
 
     $ rebar3 sbom
     ===> Verifying dependencies...
     ===> CycloneDX SBoM written to bom.xml
+
+The following command line options are supported:
+
+    -o, --output  the full path to the SBoM output file [default: bom.xml]
+    -f, --force   overwite existing files without prompting for confirmation
+                  [default: false]
+
+By default only dependencies in the 'default' profile are included. To
+generate an SBoM covering development environments specify the relevant
+profiles using 'as':
+
+    $ rebar3 as default,test,docs sbom -o dev_bom.xml