Add README.md

Author: a-melnikov

README.md

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+PHPUnit code coverage baseline
+==============================
+
+It is a base implementation of baseline support for Clover reposts of PHPUnit.
+
+Installation
+------------
+
+`composer require --dev aeliot-tm/phpunit-codecoverage-baseline`
+
+Usage
+-----
+
+1. Add baseline file to the project. See [example](docs/phpunit.clover.baseline.json).
+2. Run your tests with [configured](https://phpunit.readthedocs.io/en/9.5/configuration.html#the-report-element) 
+   code coverage Clover report or with [command line option](https://phpunit.readthedocs.io/en/9.5/textui.html?highlight=clover#command-line-options).
+   ```shell
+   phpunit --coverage-clover 'build/coverage/clover.xml' tests/
+   ```
+3. Call [script](bin/phpunit_clover_compare).
+   ```shell
+   vendor/bin/phpunit_clover_compare
+   ```
+   It accepts options:
+
+| Full name    | Short name | Description               | Default value                  |
+|--------------|------------|---------------------------|--------------------------------|
+| `--baseline` | `-b`       | Path to the baseline      | `phpunit.clover.baseline.json` |
+| `--clover`   | `-c`       | Path to the Clover report | `build/coverage/clover.xml`    |

docs/phpunit.clover.baseline.json

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+{
+  "methods": 160,
+  "coveredmethods": 159,
+  "conditionals": 0,
+  "coveredconditionals": 0,
+  "statements": 296,
+  "coveredstatements": 295,
+  "elements": 456,
+  "coveredelements": 454
+}