Extended Laptev's algorithm use case for Demo Day

[martinthenext]

Laptev's algorithm already works and is ready for demonstration in some way. If we have time before the demo it would be nice to extend the demo use case with the ability to read and analyze columns of the newly opened spreadsheet, like it was in the .xlsm demo we had with PERI (description here) on the demo day:

1. User has comnsense software installed on the PC.
2. User opens a pre-made Excel file and shows how comnsense works on it.

Excel file setup

Excel file has three columns: "Account number", "Client name", "Phone number" and three example rows added into each of them.

1. "Account number" column contains numbers of the same length.
2. "Client name" column contains made up names and surnames.
3. "Phone number" column contains phone number in some known format.

Get the file here.

Demonstrations

1. User enters the account number in the fourth row with a "typo" - a character. As account numbers are numbers, the cell gets highlighted.
2. User enters the name with no surname. The cell gets highlighted.

[martinthenext]

This should only be done if #8 is implemented as Laptev's algorithm works in some form already.