Add shortcuts (#85)

* Add yarn.lock to .gitignore

* Extract available shapes to one place

* Add event listeners for shapes shortcuts

* fixup! Add event listeners for shapes shortcuts

* Underline first letter of shapes

to indicate interactivity

* fixup! Extract available shapes to one place

* fixup! Add event listeners for shapes shortcuts

src/styles.css

@@ -18,6 +18,14 @@ label {
   margin-right: 10px;
 }
 
+label span {
+  display: inline-block;
+}
+
+label span::first-letter {
+  text-decoration: underline;
+}
+
 input[type="number"] {
   width: 30px;
 }