Add documentation about addMap, addSort, addUnwindow, and addWindow

Signed-off-by: David Arendsen <darendsen@gamepoint.com>

docs/functions/addMap.md

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+# Flux Query Builder Docs
+
+## Functions » addMap()
+
+### Parameters:
+
+<table>
+  <tbody>
+    <tr>
+      <th>Name</th>
+      <th>Required</th>
+      <th>Data type</th>
+      <th>Description</th>
+    </tr>
+    <tr>
+      <td>fn</td>
+      <td>Yes</td>
+      <td>string</td>
+      <td>Single argument function to apply to each record. The return value must be a record.</td>
+    </tr>
+  </tbody>
+</table>
+
+
+### Example
+
+```php
+->addMap('r with name: r.user')
+```
+
+This will result in the following Flux function part:
+
+```
+|> map(fn: (r) => ({ r with name: r.user })) 
+```
+
+### Extra resources
+
+* [Flux documentation](https://docs.influxdata.com/flux/v0.x/stdlib/universe/map/)

docs/functions/addSort.md

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+# Flux Query Builder Docs
+
+## Functions » addSort()
+
+### Parameters:
+
+<table>
+  <tbody>
+    <tr>
+      <th>Name</th>
+      <th>Required</th>
+      <th>Data type</th>
+      <th>Description</th>
+    </tr>
+    <tr>
+      <td>columns</td>
+      <td>Yes</td>
+      <td>array</td>
+      <td>List of columns to sort by. Default is ["_value"].</td>
+    </tr>
+  </tbody>
+</table>
+
+
+### Example
+
+```php
+->addSort(['column1', 'column2'], true)
+```
+
+This will result in the following Flux function part:
+
+```
+|> sort(columns: ["column1", "column2"], desc: true)
+```
+
+### Extra resources
+
+* [Flux documentation](https://docs.influxdata.com/flux/v0.x/stdlib/universe/sort/)

docs/functions/addUnwindow.md

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+# Flux Query Builder Docs
+
+## Functions » addUnwindow()
+
+Keeping aggregate values in separate tables generally isn’t the format in which you want your data. Use the window() function to “unwindow” your data into a single infinite (inf) window.
+
+### Example
+
+```php
+->addUnwindow()
+```
+
+This will result in the following Flux function part:
+
+```
+|> window(every: inf)
+```
+
+### Extra resources
+
+* [Flux documentation](https://docs.influxdata.com/flux/v0.x/stdlib/universe/window/)

docs/functions/addWindow.md

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+# Flux Query Builder Docs
+
+## Functions » addWindow()
+
+### Parameters:
+
+<table>
+  <tbody>
+    <tr>
+      <th>Name</th>
+      <th>Required</th>
+      <th>Data type</th>
+      <th>Description</th>
+    </tr>
+    <tr>
+      <td>every</td>
+      <td>Yes</td>
+      <td>string</td>
+      <td>Duration of time between windows.</td>
+    </tr>
+    <tr>
+      <td>options</td>
+      <td>No</td>
+      <td>array</td>
+      <td>
+        <ul>
+          <li>
+            period (string): <i>Duration of windows. Default is the 'every' value.</i>
+          </li>
+          <li>
+            offset (string): <i>Duration to shift the window boundaries by. Default is '0s'.</i>
+          </li>
+          <li>
+            location (string): <i>Location used to determine timezone. Default is the 'location' option.</i>
+          </li>
+          <li>
+            timeColumn (string): <i>Column that contains time values. Default is '_time'.</i>
+          </li>
+          <li>
+            startColumn (string): <i>Column to store the window start time in. Default is '_start'.</i>
+          </li>
+          <li>
+            stopColumn (string): <i>Column to store the window stop time in. Default is '_stop'.</i>
+          </li>
+          <li>
+            createEmpty (boolean): <i>Create empty tables for empty window. Default is false.</i>
+          </li>
+        </ul>
+      </td>
+    </tr>
+  </tbody>
+</table>
+
+
+### Example
+
+```php
+->addWindow('20s', [
+  'timeColumn' => '_time',
+])
+```
+
+This will result in the following Flux function part:
+
+```
+|> window(every: 20s, timeColumn: "_time")
+```
+
+### Extra resources
+
+* [Flux documentation](https://docs.influxdata.com/flux/v0.x/stdlib/universe/window/)