docs(simple-jwt-jjwt): Added README for module simple-jwt-jjwt

simple-jwt-jjwt/README.md

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+# Module `simple-jwt-jjwt`
+
+## Introduction
+
+The `simple-jwt-jjwt` module is an implementation of module `simple-jwt-facade` which uses the third-party library [`io.jsonwebtoken:jjwt-api`](https://github.com/jwtk/jjwt). By using this module can help you use JWT to help you in your application.
+
+## Prerequisites
+
+This whole `JDevKit` is developed by **JDK 17**, which means you have to use JDK 17 for better experience.
+
+## Installation
+
+> This module has already imported `simple-jwt-facade`, there is no need to import it again.
+
+### If you are using `Maven`
+
+It is quite simple to install this module by `Maven`. The only thing you need to do is find your `pom.xml` file in the project, then find the `<dependencies>` node in the `<project>` node, and add the following codes to `<dependencies>` node:
+
+```xml
+<dependency>
+	<groupId>cn.org.codecrafters</groupId>
+    <artifactId>simple-jwt-jjwt</artifactId>
+    <version>${simple-jwt-jjwt.version}</version>
+</dependency>
+```
+
+And run `mvn dependency:get` in your project root folder(i.e., if your `pom.xml` is located at `/path/to/your/project/pom.xml`, then your current work folder should be `/path/to/your/project`), then `Maven` will automatically download the `jar` archive from `Maven Central Repository`. This could be **MUCH EASIER** if you are using IDE(i.e., IntelliJ IDEA), the only thing you need to do is click the refresh button of `Maven`.
+
+### If you are using `Gradle`
+
+Add this module to your project with `Gradle` is much easier than doing so with `Maven`.
+
+Find `build.gradle` in the needed project, and add the following code to the `dependencies` closure in the build script:
+
+```groovy
+implementation 'cn.org.codecrafters:simple-jwt-authzero:${simple-jwt-authzero.version}'
+```
+
+### If you are not using `Maven` or `Gradle`
+
+1. Download the `jar` file from the Internet.
+2. Create a folder in your project and name it as a name you like(i.e., for me, I prefer `vendor`).
+3. Put the `jar` file to the folder you just created in Step 2.
+4. Add this folder to your project `classpath`.
+
+## Use the `JjwtTokenResolver`
+
+We have implemented `TokenResolver` to make sure you can add JWT to your Java application as soon as possible. All you need to do is to create an instance of `cn.org.codecrafters.simplejwt.jjwt.JjwtTokenResolver` and other operations to JWT could follow our instruction in [`simple-jwt-facade`](../simple-jwt-facade/README.md).
+
+## Contact
+
+If you have any suggestions, ideas, don't hesitate contacting us via [GitHub Issues](https://github.com/CodeCraftersCN/jdevkit/issues/new) or [Discord Community](https://discord.gg/NQK9tjcBB8). 
+
+If you face any bugs while using our library and you are able to fix any bugs in our library, we would be happy to accept pull requests from you on [GitHub](https://github.com/CodeCraftersCN/jdevkit/compare).