Make US and Sweden work

- Refactor test structure
- Add docker config for testing
- Extend README

Author: PhilippSchreiber

.gitignore

@@ -1,3 +1,2 @@
 vendor
-composer.lock
 

README.MD

@@ -1,6 +1,27 @@
 # libholiday - A PHP Holiday Library   
 With this library you can check if a given day is a holiday in selected country or state.
 
+## Usage Example
+
+```
+Create instance of CalculatorService:
+$holidayService = new CalculatorService();
+
+// Get actual calculator by passing country and optional state
+$calculator = $holidayService->getCalculatorByCountryAndState('DE', 'BY');
+
+```
+
+## Run tests
+You need to have docker installed. Please run:
+
+This starts the container:  
+`docker compose up -d` 
+
+This runs the tests:  
+`docker compose exec php /var/app/vendor/bin/phpunit --configuration=/var/app/phpunit.xml`
+
+
 ## Todos
 * Tests for special holidays like "Tourist Trophy Senior Race Day" on Isle of Man, see Belgium
 * Translations for holidays

composer.json

@@ -1,20 +1,30 @@
 {
-    "name": "mayflower/holiday",
-    "description": "A library to calculate holidays",
-    "type": "library",
-    "license": "LGPL-3.0+",
-    "authors": [{
-        "name": "David Soria Parra",
-        "email": "[email protected]",
-        "role": "Developer"
-    }],
-    "autoload": {
-        "psr-0": {"Holiday": "src/"}
-    },
-    "require": {
-        "php": ">= 5.4"
-    },
-    "require-dev": {
-        "phpunit/phpunit": "~4.0"
+  "name": "mayflower/holiday",
+  "description": "A library to calculate holidays",
+  "type": "library",
+  "license": "LGPL-3.0+",
+  "authors": [
+    {
+      "name": "David Soria Parra",
+      "email": "[email protected]",
+      "role": "Developer"
     }
+  ],
+  "autoload": {
+    "psr-0": {
+      "Holiday": "src/"
+    }
+  },
+  "autoload-dev": {
+    "psr-4": {
+      "Tests\\": "tests/"
+    }
+  },
+  "require": {
+    "php": ">= 7.4",
+    "ext-calendar": "*"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "~9.5.17.0"
+  }
 }