using composer package format, decoupling bsr libraries and implementation

vendor/pds/skeleton/docs/tools.md

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+# Command-Line Tools
+
+## Validator
+
+Validate your project's compliance by following these steps:
+
+- Install package in your project: `composer require pds/skeleton @dev`
+- Run the validator: `vendor/bin/pds-skeleton validate [path]`
+
+If no path is specified, the project in which pds-skeleton is installed will be used.
+
+## Generator
+
+Generate a compliant package skeleton by following these steps:
+
+- Install package in your project: `composer require pds/skeleton @dev`
+- Run the generator: `vendor/bin/pds-skeleton generate [path]`
+
+If no path is specified, the project in which pds-skeleton is installed will be used.