Add README

README.md

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+# worktracker
+
+A command line tool that calculates total time based on timestamps written in a simple human-readable format. It can be used to track time spent on work or any other kinds of tasks.
+
+## How to use
+
+The tool works in a similar way to `wc` and accepts input from stdin.
+
+`~/.log.txt`
+
+```
+1 10
+2 45
+
+11:23
+1:30
+
+13h 10m
+13h 50m
+```
+
+```console
+$ worktracker < ~/.log.txt
+
+ 1h 10m -  2h 45m => 1h 35m
+11h 23m -  1h 30m => 2h 7m
+13h 10m - 13h 50m => 40m
+
+Total time: 4h 22m
+```
+
+You can also run `worktracker` and type the timestamps manually or paste them into the terminal and press `ctrl+z` to simulate EOF.
+
+## Syntax
+
+The tool works with both **12h** and **24h** time formats.
+
+Supported timestamp formats `11 20`, `11:20`, `11h 20m`.
+
+**TODO:** add support for timestamps without minutes (`11h`)
+
+The timestamps should be written in pairs. The first one is **start**, the second one is **end**. Each pair should be separated by a newline.
+
+Timestamps with incorrect syntax are ignored.
+
+## License
+
+MIT