Added trello widget

_site/content/posts/modules/trello.md

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+---
+title: "Trello"
+date: 2018-05-10T10:44:35-07:00
+draft: false
+---
+
+Displays all Trello cards on specified lists.
+
+<img src="/imgs/modules/trello.png" width="640" height="188" alt="trello screenshot" />
+
+## Source Code
+
+```bash
+wtf/trello/
+```
+
+## Required ENV Variables
+
+<span class="caption">Key:</span> `WTF_TRELLO_APP_KEY` <br />
+<span class="caption">Value:</span> Your Trello App Key. <br />
+<span class="caption">Key:</span> `WTF_TRELLO_ACCESS_TOKEN` <br />
+<span class="caption">Value:</span> Your Trello Access Token. <br />
+
+_You can get your API key at: trello.com/app-key._
+
+## Keyboard Commands
+
+None.
+
+## Configuration
+
+### Single Trello List
+
+```yaml
+trello: 
+  board: Main
+  enabled: true
+  list: "Todo"
+  position: 
+    height: 1
+    left: 2
+    top: 0
+    width: 1
+  refreshInterval: 3600
+  username: myname
+```
+
+### Multiple Trello Lists
+
+If you want to monitor multiple Trello lists, use the following
+configuration (note the difference in `list`):
+
+```yaml
+trello: 
+  board: Main
+  enabled: true
+  list: ["Todo", "Done"]
+  position: 
+    height: 1
+    left: 2
+    top: 0
+    width: 1
+  refreshInterval: 3600
+  username: myname
+```
+
+### Attributes
+
+`board` <br />
+The name of the Trello board. <br />
+
+`enabled` <br />
+Determines whether or not this module is executed and if its data displayed onscreen. <br />
+Values: `true`, `false`.
+
+`list` <br />
+The Trello lists to fetch cards from. <br />
+
+`refreshInterval` <br />
+How often, in seconds, this module will update its data. <br />
+Values: A positive integer, `0..n`.
+
+`username` <br />
+Your Trello username. <br />
+
+`position` <br />
+Where in the grid this module's widget will be displayed. <br />