chore: add jimp dependency, icon padding script, and update configuration

node_modules/bmp-js/index.js

@@ -0,0 +1,15 @@
+/**
+ * @author shaozilee
+ *
+ * support 1bit 4bit 8bit 24bit decode
+ * encode with 24bit
+ * 
+ */
+
+var encode = require('./lib/encoder'),
+    decode = require('./lib/decoder');
+
+module.exports = {
+  encode: encode,
+  decode: decode
+};