Add English strings for future usage

Main language is still using Indonesian though.

res/values-en/strings.xml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!-- Language: English -->
+
+<resources>
+
+    <!-- Core -->
+
+    <string name="name_app">Kargu</string>
+    <string name="name_edition">Electric</string>
+    <string name="name_appedition">Kargu Electric</string>
+    <string name="version_app">Version 0.1</string>
+    <string name="tagline_app">Predicting usage cost without a doubt</string>
+
+    <!-- Menu -->
+
+    <string name="title_settings">Complete Settings</string>
+    <string name="action_settings">Settings</string>
+    <string name="button_settings">Settings</string>
+
+    <!-- Help -->
+
+    <string name="title_help">Usage Help</string>
+    <string name="action_help">Help</string>
+    <string name="button_help">Help</string>
+    <string name="dialog_help">Input data about household power and electronic appliances which you will use</string>
+
+    <!-- About -->
+
+    <string name="title_about">About Application</string>
+    <string name="button_about">About</string>
+    <string name="action_about">About</string>
+    <string name="dialog_about">Kargu Electric, predicting usage cost without a doubt and civilize to save energy</string>
+
+    <!-- Dialog -->
+
+    <string name="button_close">Close</string>
+
+    <!-- Calculation -->
+
+    <string name="edit_inputNumber">0</string>
+    <string name="button_count">Calculate</string>
+    <string name="button_reset">Reset</string>
+
+    <string name="title_number">Input number</string>
+
+</resources>

res/values/strings.xml

@@ -1,5 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 
+<!-- Language: Indonesian -->
+
 <resources>
 
     <!-- Core -->