Add installation instructions.

README.md

@@ -1,2 +1,33 @@
 # grafana-zabbix
 Zabbix API datasource for Grafana dashboard
+
+## Installation
+
+### Grafana 1.9.x
+
+Download latest release and unpack into `<your grafana installation>/plugins/datasource/`. Then edit Grafana config.js:
+  * Add dependencies
+
+    ```
+    plugins: {
+      panels: [],
+      dependencies: ['datasource/zabbix/datasource', 'datasource/zabbix/queryCtrl'],
+    }
+    ```
+  * Add datasource and setup your Zabbix API url, username and password
+  
+    ```
+    datasources: {
+      ...
+      },
+      zabbix: {
+        type: 'ZabbixAPIDatasource',
+        url: 'http://www.zabbix.org/zabbix/api_jsonrpc.php',
+        username: 'guest',
+        password: ''
+      }
+    },
+    ```
+    
+### Grafana 2.0.x
+Now in development.