Support typings

[HarelM]

It would be great if this library had typings to allow easy integration to angular and modern development tool that provide intellisense.
I have created a partial typings of what I needed as can be seen below.
Instruction of how to add this can be found here:
https://www.typescriptlang.org/docs/handbook/declaration-files/publishing.html
In short, you need to add a index.d.ts file and add a link in the package.json file to it.
Here's what I wrote - I'm sure it's pretty partial/incorrect:

export interface IOAuthResponse {
    oauth_token: string;
    oauth_token_secret: string;
}

export interface IOAuthParams {
    oauth_consumer_key: string;
    oauth_signature_method: string;
    oauth_timestamp: number;
    oauth_nonce: string;
    oauth_token: string;
    oauth_signature: string;
}

export interface IOhAuth {
    signature: (authSecret: string, tokenSecret: string, parameters: string) => string;
    baseString: (method: string, url: string, params: IOAuthParams) => string;
    /**
     * generates a querystring from an object
     */
    qsString: (obj: {}) => string;
    /**
    * generate an object from a querystring
    */
    stringQs: (str: string) => IOAuthResponse;
    timestamp: () => number;
    nonce: () => string;
    xhr: (method: string, url: string, params: {}, data: {}, options: {}, callback: (err, xhr) => void) => void;
}

[bhousel]

⛔️ This project has been deprecated and will not receive any regular maintenance.
The preferred authentication method for OpenStreetMap is now OAuth2, therefore this library isn't used anymore.