docs(plugins): update readme to link to docs

examples/datasource-plugin-genericdatasource/README.md

@@ -1,75 +1,12 @@
 #Generic backend datasource#
 
-This is a very minimalistic datasource that forwards http requests in a defined format. The idea is that anybody should be able to build an api and retrieve data from any datasource without built-in support in grafana.
+More documentation about datasource plugins can be found in the [Docs](https://github.com/grafana/grafana/blob/master/docs/sources/plugins/datasources.md)
 
-Its also serves as an living example implementation of a datasource.
-
-A guide for installing plugins can be found at [placeholder for links].
-
-Your backend need implement 3 urls
+Your backend need implement 4 urls
  * "/" Should return 200 ok. Used for "Test connection" on the datasource config page.
  * "/search" Used by the find metric options on the query tab in panels
  * "/query" Should return metrics based on input
+ * "/annotations" should return annotations
 
-## Metric discovery ##
-
-### Request ###
-```
-{ refId: 'F', target: 'select metric' }
-```
-### Expected Response ###
-
-An array of options based on the target input
-
-####Example####
-```
-["upper_25","upper_50","upper_75","upper_90","upper_95"]
-```
-
-## Metric query ##
-
-### Request ###
-```
-{
-  range: { from: '2015-12-22T03:06:13.851Z',to: '2015-12-22T06:48:24.137Z' },
-  interval: '5s',
-  targets:
-   [ { refId: 'B', target: 'upper_75' },
-     { refId: 'A', target: 'upper_90' } ],
-  format: 'json',
-  maxDataPoints: 2495 //decided by the panel
-}
-```
-### Expected response ###
-
-An array of
-```
-{
-  "target":"target_name",
-  "datapoints":[
-    [intvalue, timestamp in epoch],
-    [intvalue, timestamp in epoch]
-  ]
-}
-```
-###Example###
-```
-[
-  {
-    "target":"upper_75",
-    "datapoints":[
-      [622,1450754160000],
-      [365,1450754220000]
-    ]
-  },
-  {
-    "target":"upper_90",
-    "datapoints":[
-      [861,1450754160000],
-      [767,1450754220000]
-    ]
-  }
-]
-```
 ## Example backend implementation ##
 https://gist.github.com/bergquist/bc4aa5baface3cffa109

examples/datasource-plugin-genericdatasource/plugin.json

@@ -3,8 +3,6 @@
   "id": "datasource-plugin-genericdatasource",
   "type": "datasource",
 
-  "module": "plugins/genericdatasource/datasource",
-
   "staticRoot": ".",
 
   "metrics": true,