chore: Update README.md with Sulu signup information

Author: Samuel Alarco

README.md

@@ -9,16 +9,18 @@ Before you start exploring these examples, you need to know the following:
     * You need to find an appropriate HTTP client library for your programming language of choice.
 3. These examples have been tested on Ubuntu 22.04 but should work anywhere you can run Bash scripts.
 4. To have you get started fast, these examples use the [Shared Cloud](https://judge0.com/#pricing) of Judge0 CE and Judge0 Extra CE.
-    * There is a FREE plan of Judge0 CE which you can subscribe to [here](https://judge0.com/ce).
+    * [Sign up](https://sparkhub.sulu.sh/auth/signup) to use Judge0 CE and Judge0 Extra CE on [Sulu](https://sparkhub.sulu.sh/apis/judge0/judge0-ce/readme) and get **20K Free Submissions** to try out these examples.
+    * There is also a FREE plan of Judge0 CE which you can subscribe to [here](https://judge0.com/ce).
     * There is also a FREE plan of Judge0 Extra CE, which you can subscribe to [here](https://judge0.com/extra-ce).
 
 ## Prerequisites
 
 To successfully run these examples, you will need to:
-1. [Subscribe to the FREE plan of Judge0 CE.](https://judge0.com/ce)
-2. [Subscribe to the FREE plan of Judge0 Extra CE.](https://judge0.com/extra-ce)
+1. [Sign up to use Judge0 CE and Judge0 Extra CE on Sulu with 20K Free Submissions](https://sparkhub.sulu.sh/auth/signup) OR
+    * [Subscribe to the FREE plan of Judge0 CE.](https://judge0.com/ce)
+    * [Subscribe to the FREE plan of Judge0 Extra CE.](https://judge0.com/extra-ce)
 3. Clone this repository.
-4. Edit the file [`.env`](https://github.com/judge0/examples/blob/master/.env) and add the API key that [RapidAPI generated for you](https://docs.rapidapi.com/docs/keys).
+4. Edit the file [`.env`](https://github.com/judge0/examples/blob/master/.env) and add the API key that [Sulu generated for you](https://sparkhub.sulu.sh/portal/consumer/dashboard). If you are using RapidAPI, [the process is similar](https://docs.rapidapi.com/docs/keys).
 5. Make sure you have [`curl`](https://reqbin.com/Article/InstallCurl) and [`jq`](https://stedolan.github.io/jq/download/) installed.
 6. **macOS** Make sure you have `gbase64` in your `PATH`. It can be installed with `brew install coreutils`.