chore: Add extension list on README.md

Author: dogukanoksuz

README.md

@@ -1,6 +1,6 @@
 # Liman
 
-Liman allows you to centrally manage all servers in your IT processes remotely, with stable and secure way. You can improve the features with expandable extensions and modules. 
+Liman allows you to centrally manage all servers, clients and network devices in your IT processes remotely, with stable and secure way. You can improve the features with expandable extensions and modules. 
 
 More information on the Liman [website](https://liman.havelsan.com.tr).
 
@@ -13,6 +13,19 @@ As an open source version of Liman, it meets your basic needs for server managem
 * User and Role Management
 * Web based management
 
+## Open Source Extensions
+
+* Inventory (This open-source tool allows you to scan your network to discover connected devices and find their packages. It also provides statistical data for your devices on the network.)
+  Download: [Extension](https://github.com/limanmys/liman-inventory) [Server](https://github.com/limanmys/inventory-server)
+
+## Enterprise Extensions
+
+* [Device Manager](https://liman.havelsan.com.tr/extensions/device-manager) (Manages Win/Linux servers and clients with our Agent)
+* [Network Monitor](https://liman.havelsan.com.tr/extensions/network-monitor)
+* [Network Explorer](https://liman.havelsan.com.tr/extensions/network-explorer) (Explores all devices on your network using switches and custom sensor agents)
+* Netconf Utility (Monitors switch interfaces and let you configure network devices)
+* [Domain Manager](https://liman.havelsan.com.tr/extensions/domain-manager)
+
 ## Install
 
 Liman is packaged as DEB in Aciklab repository. Therefore, it supports Debian and RHEL based distributions.