Add keywords

Specify keywords for discoverability.

package.json

@@ -1,5 +1,5 @@
 {
-  "version": "1.1.2",
+  "version": "1.1.3",
   "license": "MIT",
   "main": "dist/index.js",
   "typings": "dist/index.d.ts",
@@ -78,5 +78,17 @@
     "tslib": "^2.0.0",
     "typescript": "^3.9.7",
     "mem": "^6.1.0"
-  }
+  },
+  "keywords": [
+    "component",
+    "react",
+    "piano",
+    "pianoforte",
+    "piano-keyboard",
+    "musical-keyboard",
+    "music",
+    "keyboard",
+    "instrument",
+    "midi"
+  ]
 }