docs: description of functionality

feat: simple user interface

fix: confirm transaction

feat(transactions): transaction processing, verification and notification of users

test: fix multithreading in transaction processing test

test: transaction processing testing

refactor: minor correction to the alert text

feat: confirm transaction logic

test: transaction confirmation testing

test: refactor tests

feat: check sender user balance

test: fix check user balance test

test: user balance testing

test: negative balance testing

docs: new methodology in readme

start of the project

modified readme

add readme

add new generic selectoin

add mutation probabylity

add mutation