Create README.md

Author: sl0wik

README.md

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+# Model random ID generator.
+
+Automatically generate cryptographic random integers that fits mysql BIGINT column and JavaScript MAX_SAFE_INTEGER.
+
+## Installation
+
+Make sure your model id is a BIGINT for example: `$table->bigInteger('id')->primary();`.
+
+
+Add to your model `use Firevel\ModelRandomId\HasRandomId;` and 
+```
+    /**
+     * Primary key incrementing.
+     *
+     * @var bool
+     */
+    public $incrementing = false;
+```