feat: add immutable tri tuple

Closes #80

Author: siujamo

tuple/README.md

@@ -0,0 +1,74 @@
+# Tuple
+
+## Introduction
+
+The `tuple` module provides simple and efficient implementations of mutable and immutable bi-tuples and tri-tuples. These tuples allow you to group two or three values together without creating custom classes, supporting convenient usage in various programming scenarios.
+
+## Features
+
+- Immutable and mutable versions of bi-tuples (pairs) and tri-tuples (triplets);
+- Factory method of() for easy instantiation of all tuple types;
+- Simple, lightweight implementation compatible with standard Java usage;
+- Clear distinction between mutable and immutable tuples for flexibility.
+
+## Installation
+
+### Maven
+
+Add the following dependency to your `pom.xml`:
+
+```xml
+<dependency>
+    <groupId>com.onixbyte</groupId>
+    <artifactId>tuple</artifactId>
+    <version>$artefactVersion</version>
+</dependency>
+```
+
+### Gradle
+
+#### Version Catalogue
+
+Add the following codes to you `gradle/libs.versions.toml`:
+
+```toml
+[version]
+onixbyteToolbox = "$artefactVersion"
+
+[libraries]
+onixbyteToolbox-tuple = { group = "com.onixbyte", name = "tuple", version.ref = "onixbyteToolbox" }
+```
+
+Then add the following codes to your `build.gradle.kts` or `build.gradle` dependencies block:
+
+```kotlin
+implementation(libs.onixbyteToolbox.tuple)
+```
+
+```groovy
+implementation libs.onixbyteToolbox.tuple
+```
+
+#### Kotlin DSL
+
+Add the following line to your `build.gradle.kts` dependencies block:
+
+```kotlin
+implementation("com.onixbyte:tuple:$artefactVerison")
+```
+
+#### Groovy DSL
+
+Add the following line to your `build.gradle` dependencies block:
+
+```groovy
+implementation 'com.onixbyte:tuple:${artefactVersion}'
+```
+
+## Dependencies
+
+This module has no external dependencies other than the standard Java SDK.
+
+## Acknowledgement
+
+Thanks to all contributors who helped develop this module, improving its design, performance, and documentation over time.