Update README and DEVELOPMENT

Author: ngyongzhen

DEVELOPMENT.md

@@ -19,23 +19,16 @@ Execute following command from the `sdk` folder to start testing.
 npm run test
 ```
 
-## Running sample angular app
+## Building custom SDK for sample angular app
+
+Repository to get sample app: https://github.com/imagekit-samples/quickstart
 
-Every sample app requires a different version of Angular CLI. Please refer to the individual sample app `Readme.md` for details.
 Before sample apps can be used, `imagekitio-angular` library needs to be packed and installed using the file system within the sample apps. Use the following steps to run any sample app.
 
 1. In the `sdk` folder, install dependencies with `npm install`
 2. Build library with `npm run build`
 3. In the `sdk/dist/imagekitio-angular` folder, use `npm pack` to create a tarball with version mentioned in the current package.json for sdk. 
-4. Go to `samples/imagekitio-angular-sample` folder and use `npm install` to install dependencies.
-5. Use `npm install ../../sdk/dist/imagekitio-angular/imagekitio-angular-x.x.x.tgz` where x.x.x needs to be replaced with the current version. For example, SDK version is `0.0.1`, then above command becomes `npm install ../../sdk/dist/imagekitio-angular/imagekitio-angular-0.0.1.tgz`
+4. Go to the Angular sample app's root folder and use `npm install` to install dependencies.
+5. Use `npm install <path to this SDK>/sdk/dist/imagekitio-angular/imagekitio-angular-x.x.x.tgz` where x.x.x needs to be replaced with the current version. For example, SDK version is `0.0.1`, then above command becomes `npm install <path to this SDK>/sdk/dist/imagekitio-angular/imagekitio-angular-2.0.0.tgz`
 6. Configure sample app with required keys. Use each app's `Readme.md` for exact details.
-7. Use npm start from the `samples/imagekitio-angular-sample` folder to run the app for a particular angular version.
-
-## Running sample backend server
-
-Sample server for upload implementation is available at `samples/sample-server`. To run the server, follow these steps
-
-1. Create a `.env` file based on `sample.env` and enter your private key.
-2. Use `npm install` to install dependencies. 
-3. Use `npm run server` to start the server. It will expose the [authentication endpoint](https://docs.imagekit.io/api-reference/upload-file-api/client-side-file-upload#how-to-implement-authenticationendpoint-endpoint) on `http://localhost:3000/auth`
+7. Use npm start from the Angular sample app's root folder to run the app

README.md

@@ -549,6 +549,11 @@ Sample Usage
 | validateFile | Function callback | Optional. Called before the upload is started to run custom validation. The first and only argument is the file selected for upload. If the callback returns `true`, the upload is allowed to continue. But, if it returns `false`, the upload is not done |
 | onSuccess   | Function callback | Optional. EventEmitter. Called if the upload is successful. The first and only argument is the response JSON from the upload API. The request-id, response headers, and HTTP status code are also accessible using the `$ResponseMetadata` key that is exposed from the [javascript sdk](https://github.com/imagekit-developer/imagekit-javascript#access-request-id-other-response-headers-and-http-status-code) |
 | onError   | Function callback | Optional. EventEmitter. Called if upload results in an error. The first and only argument is the error received from the upload API |
+| urlEndpoint      | String | Optional. For example, https://ik.imagekit.io/your_imagekit_id/endpoint/ |
+| publicKey      | String | Optional |
+| authenticationEndpoint      | String | Optional |
+
+Note: All three `urlEndpoint`, `publicKey` and `authenticationEndpoint` must be present in the attribute for them to take effect. Otherwise, the SDK will fall back to the values specified in `app.module.ts`.
 
 Sample usage