Update README.md

README.md

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-# Projekt Taschenrechner
+# Calculator
+
+## Description
+
+This versatile calculator program, written in C, offers various modes catering to different mathematical needs, including basic arithmetic, scientific calculations, unit conversions, functions, geometric calculations, and binary operations.
+
+## Features
+
+### Basic Calculator
+- User-friendly interface
+- Support for integer arithmetic
+- Error handling for division by zero
+- Programming mode for interactive calculations
+
+### Scientific Calculator
+- Advanced scientific functions
+- Trigonometric and logarithmic operations
+- Mathematical constants support
+
+### Unit Converter
+- Conversion between different units
+- Length, weight, volume, and more
+
+### Function Calculator
+- Evaluate mathematical functions
+- Input and output functions as variables
+
+### Geometric Calculator
+- Solve geometric problems
+- Area, perimeter, and other geometric calculations
+
+### Binary Calculator
+- Perform binary arithmetic
+- Convert between binary and decimal
+
+## Getting Started
+
+### Prerequisites
+
+- C compiler (e.g., GCC)
+
+### Installation
+
+1. Clone the repository:
+
+   ```bash
+   git clone https://gitlab.cs.hs-fulda.de/fdai7766/caschenrechner.git
+