doc: create CHANGELOG.md

CHANGELOG.md

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+# CHANGELOG
+
+## v3.0.0 (unreleased)
+
+### Breaking changes
+
+* Drop support for PHP < 8.1
+* Drop support for Symfony < 5.4
+* Drop support for zabbix collector
+* Drop support for librato collector
+* Rename InfluxDB collector to InfluxDbV1
+* Change inner dependency of InfluxDbV1
+* Change inner dependency of Prometheus
+* Remove the TaggableCollectorInterface. Tags can be injected in the constructor
+  instead
+
+### New features
+
+* collector:
+  * Ensure all collectors cannot raise error or exception
+* bundle:
+  * All collectors has alias for autowiring. Use
+    `#[Target('name-of-the-collector')]` to inject a collector
+  * All collectors are tagged with `kernel.reset` to reset their state
+  * All collectors are tagged with
+    `Beberlei\Metrics\Collector\CollectorInterface`
+* add a symfony application in the `examples` folder will all collectors enabled
+  and visualisation with Grafana
+
+### Minor changes
+
+* collector:
+    * Fix doctrine dbal deprecations
+* chore:
+    * modernise PHP code, use PHP 8.1 features
+    * add license file, and link it in each PHP files
+* ci:
+    * use symfony/phpunit-bridge instead of phpunit
+    * add php-cs-fixer
+    * add phpstan
+    * replace Travis by GitHub Actions
+* composer:
+    *  move tests to it's own folder, and it's own autoloader