Added folder for custom typings

src/typings/README.md

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+This folder should only contain custom TypeScript type definitions (.d.ts) files.
+
+Only place your own type definitions here or ones that you must temporarily copy/modify.
+Unless you have no choice, you should install type definitions using `typings install ... --save`.
+
+If you install typings using the command above:
+* typings.json will be updated
+* the typings will be downloaded in the root typings folder (i.e., not this one)
+* references to these typings files will be added to both `main.d.ts` and `browser.d.ts` in the root typings folder
+
+All type definition files in this folder will automatically be picked up by the TypeScript compiler.
+
+For more details about the typings CLI, check out the official docs: https://github.com/typings/typings

src/typings/custom.d.ts

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+/*
+ * Custom Type Definitions
+ * When including 3rd party modules you also need to include the type definition for the module
+ * if they don't provide one within the module. You can try to install it with typings
+
+ typings install node --save
+
+ * If you can't find the type definition in the registry we can make an ambient definition in
+ * this file for now. For example
+
+ declare module "my-module" {
+ export function doesSomething(value: string): string;
+ }
+
+ *
+ * If you're prototying and you will fix the types later you can also declare it as type any
+ *
+
+ declare var assert: any;
+
+ *
+ * If you're importing a module that uses Node.js modules which are CommonJS you need to import as
+ *
+
+ import * as _ from 'lodash'
+
+ * You can include your type definitions in this file until you create one for the typings registry
+ * see https://github.com/typings/registry
+ *
+ */
+
+/// <reference path="custom/require.d.ts" />