Add textPanel to grafana builder. (#341)

* Add textPanel to grafana builder.

Signed-off-by: Tom Wilkie <[email protected]>

* make fmt

Signed-off-by: Tom Wilkie <[email protected]>

Author: tomwilkie

grafana-builder/grafana.libsonnet

@@ -320,6 +320,25 @@
     ],
   },
 
+  textPanel(title, markdown):: {
+    type: 'text',
+    title: title,
+    options: {
+      content: markdown,
+      mode: 'markdown',
+    },
+    transparent: true,
+    datasource: null,
+    timeFrom: null,
+    timeShift: null,
+    fieldConfig: {
+      defaults: {
+        custom: {},
+      },
+      overrides: [],
+    },
+  },
+
   stack:: {
     stack: true,
     fill: 10,