Update README.md

README.md

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-# extrack
+# extrack - extracting information out of your expenses
+
+extrack is a CLI written in Rust to easily parse and summarize bank transaction excel sheets.
+It can be used to find information related to your spending and earnings in total and by category, 
+straight from your command line without having to send any data to a server.
+
+## Installation
+Installation requires Rust with Cargo installed.
+
+```bash
+git clone https://github.com/vifraa/extrack.git
+cd extrack
+cargo build --release
+```
+
+
+## Usage
+The most basic usage is by entering the path to the excel sheet as an input argument.
+For example: 
+```bash
+extrack <path_to_input_file>
+```
+
+This will output the result straight to the command line.
+To save the result in a file you can either direct the result from the above command or give a path to where the output will be saved.
+```bash
+# Redirect the output to a file
+extrack <path_to_input_file> > result.csv
+# Use output argument
+extrack <path_to_input_file> --output result.csv
+```
+
+For more information regarding available input arguments and flags please use `extrack --help`.
+
+## License
+
+Copyright (c) 2021-present [Viktor Franzén](https://github.com/vifraa)
+
+Licensed under [GNU General Public License v3.0](./LICENSE)