feat: update READMEv0.1.0

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-# License
+# term-clock
+
+A digital clock that runs in your terminal, providing clock, alarm and timer.
+
+## Features
+
+- **Clock Mode**: Digital display of current time (24-hour format)
+- **Alarm Mode**: Screen flashes at the specified time
+- **Timer Mode**: Countdown timer (up to 99 minutes)
+
+## Installation
+
+```bash
+go install github.com/nsfisis/term-clock@latest
+```
+
+## Usage
+
+### Clock Mode
+
+Displays the current time in digital format.
+
+```bash
+term-clock clock
+```
+
+### Alarm Mode
+
+The screen flashes when the specified time is reached. Time should be specified in 24-hour format (HH:MM).
+
+```bash
+term-clock alarm 07:00  # Alarm at 7:00 AM
+```
+
+### Timer Mode
+
+Counts down from the specified duration. Time should be specified using Go's duration format.
+The screen flashes when the timer ends.
+
+```bash
+term-clock timer 25m    # 25-minute timer
+term-clock timer 90s    # 90-second timer
+term-clock timer 1h30m  # 1 hour 30 minutes timer (note: maximum 99 minutes)
+```
+
+## How to Exit
+
+Press `Ctrl+C` or type `q` to exit.
+
+## License
 
 The MIT License