Set Publish build and update README.md about dependency control

Author: Zayden-Gabia

README.md

@@ -1,8 +1,14 @@
 # Spring Sheet Ease
-> This library in developing stage, we will update this to maven soon
-
 In services run on the Spring web framework, sometimes data must be offered in Excel instead of JSON. This library simplifies the process, allowing the conversion of JSON data to Excel files for download with just one annotation, bypassing the complexity of using tools like Apache POI
 # Usage
+Append dependency
+```xml
+<dependency>
+  <groupId>com.beoks</groupId>
+  <artifactId>spring-web-excel</artifactId>
+  <version>0.0.1-SNAPSHOT</version>
+</dependency>
+```
 You need only append `@ExcelDownload` annotation to Controller Method.
 ```java
 @RestController

build.gradle

@@ -2,6 +2,7 @@ plugins {
     id 'java'
     id 'org.springframework.boot' version '3.2.3'
     id 'io.spring.dependency-management' version '1.1.4'
+    id "maven-publish"
 }
 
 group = 'com.beoks'
@@ -15,6 +16,24 @@ repositories {
     mavenCentral()
 }
 
+publishing {
+    repositories {
+        maven {
+            name = "GitHubPackages"
+            url = uri("https://maven.pkg.github.com/BEOKS/SpringSheetEase")
+            credentials {
+                username = project.findProperty("gpr.user") ?: System.getenv("GITHUB_USERNAME")
+                password = project.findProperty("gpr.key") ?: System.getenv("GITHUB_PUBLISH_TOKEN")
+            }
+        }
+    }
+    publications {
+        gpr(MavenPublication) {
+            from(components.java)
+        }
+    }
+}
+
 dependencies {
     implementation 'org.springframework.boot:spring-boot-starter-web'
     implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310'