Create README.md

Author: K-Adam

README.md

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+# PHP .env editor
+
+A `.env` file editor library for PHP.
+
+## Usage example
+
+```php
+$envFile = \EnvEditor\EnvFile::loadFrom(__DIR__."/.env.example");
+
+$envFile->setValue("exampleKey", "exampleValue");
+$envFile->setValue("LOG_DIR", __DIR__."/logs");
+// ...
+
+$envFile->saveTo(__DIR__."/.env");
+```