chore(docs): add an example of configuration JSON

Also I marked Phar file as recommended setup method

Author: IvanChepurnyi

README.md

@@ -14,19 +14,60 @@ It is highly configurable and optimized for performance with concurrency and bat
 - No compromise on performance!
 - JSONSchema for configuration validation, no more guessing when editing config file.
 
+## Configuration file example
+
+If you want to export / import data from mysql server reachable via `db` hostname 
+and exclude tables that match indexation patterns, you configuration file will look like this:
+```json
+{
+  "$schema": "https://raw.githubusercontent.com/EcomDev/mysql-to-jsonl/main/schema.json",
+  "config": {
+    "connection": {
+      "host": "db",
+      "database": "magento",
+      "user": "magento",
+      "password": "magento"
+    },
+    "excludeTables": [
+      {
+        "endsWith": "_cl"
+      },
+      {
+        "contains": "_tmp_"
+      },
+      {
+        "contains": "_index_"
+      },
+      {
+        "endsWith": "_index"
+      },
+      {
+        "endsWith": "_replica"
+      },
+      {
+        "regexp": "/^inventory_stock_\\d+$/"
+      }
+    ],
+    "concurrency": 12
+  }
+}
+```
+
+Notice the `$schema` in as the first element? Specifying it like this in your config files 
+allows your favorite IDE's to auto-complete and validate configuration properties.
 
 ## Installation
 
+### Phar (Recommended)
+
+Download pre-bundled application from [Releases](https://github.com/EcomDev/mysql-to-jsonl/releases)
+
 ### Composer
 
 ```bash
 composer require ecomdev/mysql2jsonl
 ```
 
-### Phar
-
-Download pre-bundled application from [Releases](https://github.com/EcomDev/mysql-to-jsonl/releases)
-
 
 ## 📜 License