docs: update README

# to-be-continuous utils

# tbc-check CLI tool

Various to-be-continuous internal utility tools.

`tbc-check` is a basic CLI program that checks to-be-continuous templates.

## template-to-component

This program helps migrating to-be-continuous legacy templates (include:project) to GitLab CI/CD components (include:component).

Usage:

## Usage

```bash

# install dependencies

poetry install

# obtain help

poetry run t2c --help

poetry run tbc-check --help

# run tool

poetry run t2c path/to/tbc/template

poetry run tbc-check path/to/tbc/template

```

## Checked rules

`tbc-check` checks the following rules:

- the existence of the `kicker.json` file

- the existence of the `README.md` file

- for each variable in the `kicker.json` file (main template and variants):

    - mapped input is declared in the related template with same name, type, default, options and description (WARNING only)

    - the variable is declared in the related template with expected input mapping (`$[[ inputs.input-name ]]`)

    - the input/variable is documented in the README (WARNING only)

If any non-WARNING rule fails, `tbc-check` fails with exit code 127.