Create README.md

Author: xn-coder

README.md

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+<h1>Calculator App - Android Project</h1>
+
+This Android project is a simple calculator app that performs basic mathematical operations like addition, subtraction, multiplication, and division. The app is built using Java programming language and Android Studio.
+<h2>Features</h2>
+<ul>
+  <li>Addition</li>
+  <li>Subtraction</li>
+  <li>Multiplication</li>
+  <li>Division</li>
+  <li>Clear button</li>
+  <li>Error handling for division by zero</li>
+</ul>
+<h2>Installation</h2>
+<ol>
+  <li>Clone the repository using git clone https://github.com/XNCoders/Calc.git or download the ZIP file and extract it.</li>
+  <li>Open the project in Android Studio.</li>
+  <li>Build the project using Gradle.</li>
+  <li>Run the app on an Android device or emulator.</li>
+</ol>
+<h2>Usage</h2>
+<ol>
+  <li>Open the app.</li>
+  <li>Enter the first number using the number buttons.</li>
+  <li>Select the operation you want to perform using the corresponding button.</li>
+  <li>Enter the second number using the number buttons.</li>
+  <li>Press the equals button to perform the operation.</li>
+  <li>Press the clear button to clear the input fields and result.</li>
+</ol>
+<h2>Contributing</h2>
+
+If you would like to contribute to this project, please fork the repository and submit a pull request.
+<h2>License</h2>
+
+This project is licensed under the MIT License - see the LICENSE file for details.
+<h2>Tags</h2>
+
+android, calculator, java, arithmetic operations, mobile app, open source.