Customize boilerplate for project

Add a free license, write readme, change app and project name, update
info in package.json.

android/app/src/main/AndroidManifest.xml

@@ -1,5 +1,5 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.counter">
+    package="com.exactresistorcalculator">
 
     <uses-permission android:name="android.permission.INTERNET" />
 

android/app/src/main/java/com/counter/MainActivity.java

@@ -1,4 +1,4 @@
-package com.counter;
+package com.exactresistorcalculator;
 
 import com.facebook.react.ReactActivity;
 
@@ -10,6 +10,6 @@ public class MainActivity extends ReactActivity {
      */
     @Override
     protected String getMainComponentName() {
-        return "Counter";
+        return "exactresistorcalculator";
     }
 }

android/app/src/main/java/com/counter/MainApplication.java

@@ -1,4 +1,4 @@
-package com.counter;
+package com.exactresistorcalculator;
 
 import android.app.Application;
 import android.util.Log;

android/app/src/main/res/values/strings.xml

@@ -1,3 +1,3 @@
 <resources>
-    <string name="app_name">Counter</string>
+    <string name="app_name">Exact Resistor Calculator</string>
 </resources>