Added the missing file of Nativescript module

Author: Rohit Mishra

nativescript.js

@@ -0,0 +1 @@
+module.exports = require('./dist/nativescript/contentstack');

package.json

@@ -15,7 +15,7 @@
         "buildnode": "webpack --config webpack/webpack.node.js",
         "buildweb": "webpack -p --config webpack/webpack.web.js",
         "buildreactnative": "webpack --config webpack/webpack.react-native.js",
-        "buildnativescript": "webpack --config webpack/webpack.native-script.js",
+        "buildnativescript": "webpack --config webpack/webpack.nativescript.js",
         "buildall": "npm run buildnode&npm run buildweb&npm run buildreactnative&npm run buildnativescript",
         "generate-docs": "node_modules/.bin/jsdoc --configure docs-config.json --verbose"
     },

src/runtime/nativescript/http.js

@@ -0,0 +1 @@
+export default fetch;

src/runtime/nativescript/localstorage.js

@@ -0,0 +1,3 @@
+import localStorage from 'localStorage';
+
+export default localStorage;

webpack/webpack.nativescript.js

@@ -0,0 +1,40 @@
+'use strict';
+
+const path = require('path');
+const webpackMerge = require('webpack-merge');
+
+const commonConfig = require('./webpack.common.js');
+
+module.exports = function(options) {
+    return webpackMerge(commonConfig(), {
+        output: {
+            library: "Contentstack",
+            libraryTarget: "commonjs2",
+            path: path.join(__dirname, "../dist/nativescript"),
+            filename: "contentstack.js"
+        },
+        resolve: {
+            alias: {
+                runtime: path.resolve(__dirname, '../src/runtime/nativescript')
+            },
+            modules: [
+                '../src',
+                '../src/runtimes/native-script',
+                'node_modules',
+            ]
+        },
+        module: {
+            rules: [{
+                test: /\.js?$/,
+                exclude: ['../node_modules'],
+                use: [{
+                    loader: 'string-replace-loader',
+                    query: {
+                        search: '{{PLATFORM}}',
+                        replace: 'react-native'
+                    }
+                }],
+            }]
+        }
+    });
+}