Add Kalente logo and update README with more details on usage and requirements

- Add Kalente logo
- Update README with more details on usage and requirements
- Include instructions on installation and usage
- Mention future updates for language and format support
- Provide examples of command line usage for generating weekly and monthly calendars
- Inform about available options using `--help`
- Mention the MIT license and refer to the LICENSE file for more information

README.md

@@ -1,11 +1,78 @@
 # Kalente
 
-Kalente is a simple Python script for generating PDF calendars. 
+![Kalente Logo](img/kalente.png)
 
-It can be used to generate weekly calendars at the moment, but it will be 
-extended to support monthly and yearly calendars as well.
+Kalente is a simple Python script for generating PDF calendars.
+
+It can be used to generate weekly and monthly calendars at the moment, and it
+will be extended to support yearly calendars as well.
+
+Currently, Kalente can only generate calendars in English, but support for
+other languages will be added in the future. Also, calendars are currently
+generated in A4 landscape format, but support for other formats will be added
+in the future. If you can help with any of these, please feel free to open a
+pull request.
+
+## Requirements
+
+Kalente should work with any Python version from 3.8 onwards.
+
+It also requires wkhtmltopdf to be installed on your system. You can find
+instructions on how to install it on your system
+[on the project's website](https://wkhtmltopdf.org/).
+
+## Installation
+
+First, set up a virtual environment for Kalente:
+
+```bash
+python -m venv venv
+```
+
+Then, activate the virtual environment:
+
+```bash
+source venv/bin/activate
+```
+
+You can install Kalente using pip:
+
+```bash
+pip install kalente
+```
+
+## Usage
+
+Kalente can be used as a command line tool to generate calendars. You can
+generate weekly calendars using the following command:
+
+```bash
+kalente --type weekly --date 2021-01-01 --output weekly.pdf
+```
+
+This will generate a weekly calendar for the week of January 1st, 2021. The
+calendar will be saved to the file `weekly.pdf`.
+
+You can also generate monthly calendars using the following command:
+
+```bash
+kalente --type monthly --date 2021-08-01 --output monthly.pdf
+```
+
+This will generate a monthly calendar for August 2021 and save it to the file
+`monthly.pdf`.
+
+You can also use the `--help` option to get more information about the
+available options:
+
+```bash
+kalente --help
+```
+
+For example, you may want to look into the `--end-date` and `--count` options
+to generate calendars for multiple weeks or months.
 
 ## License
 
 Kalente is licensed under the MIT license. See the [LICENSE](LICENSE) file for
-more information.
+more information.