Add usage information to README

README.md

@@ -1,3 +1,27 @@
 # clj-nvd
 
 A sketch of using [lein-nvd](https://github.com/rm-hull/lein-nvd) with deps.edn.
+
+## Usage
+
+```sh
+clojure -Sdeps '{:deps {clj-nvd {:git/url "https://github.com/miikka/clj-nvd.git" :sha "141d54f5304e53f6caa6e3de1677f3cfb04091f4"}}}' -m clj-nvd.core check
+```
+
+Alternatively, add clj-nvd as a git dependency to your `deps.edn`:
+
+```clojure
+{:aliases {:clj-nvd {:extra-deps {clj-nvd {:git/url "https://github.com/miikka/clj-nvd.git"
+                                           :sha "141d54f5304e53f6caa6e3de1677f3cfb04091f4"}}
+                     :main-opts ["-m" "clj-nvd.core"]}}}
+```
+
+```sh
+clojure -A:clj-nvd check
+```
+
+To specify the `:extra-deps` aliases to check, use `-A`:
+
+```sh
+clojure -A:clj-nvd check -A backend:frontend
+```