update readme and composer json

README.md

 # mirfalah/laravel-payment
 
-This library is not complete yet, this is just placeholder
+## Installation
+Add the following repository to composer.json
+```json
+{
+    "repositories": [
+        {
+            "type": "composer",
+            "url": "https://composer.mirfalah.my"
+        }
+    ]
+}
+```
+```shell script
+composer install mirfalah/laravel-payment ^1.0
+```

composer.json

         "illuminate/support": ">=5.0 <8.0",
         "illuminate/http": ">=5.0 <8.0"
     },
+    "suggest": {
+        "mirfalah/laravel-payment-senangpay": "^1.0",
+        "mirfalah/laravel-payment-razerpay": "^1.0"
+    },
     "license": "Mirfalah-Tech",
     "authors": [
         {