Add addCount, addFirst, addMax, and addMin functions

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

docs/functions/addCount.md

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+# Flux Query Builder Docs
+
+## Functions » addCount()
+
+### Parameters:
+
+<table>
+  <tbody>
+    <tr>
+      <th>Name</th>
+      <th>Required</th>
+      <th>Data type</th>
+      <th>Description</th>
+    </tr>
+    <tr>
+      <td>column</td>
+      <td>No</td>
+      <td>string</td>
+      <td>Column to count values in and store the total count.</td>
+    </tr>
+  </tbody>
+</table>
+
+
+### Example
+
+```php
+->addCount("_value")
+```
+
+This will result in the following Flux function part:
+
+```
+|> count(column: "_value")
+```
+
+### Extra resources
+
+* [Flux documentation](https://docs.influxdata.com/flux/v0.x/stdlib/universe/count/)

docs/functions/addFirst.md

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+# Flux Query Builder Docs
+
+## Functions » addFirst()
+
+### Parameters:
+
+<table>
+  <tbody>
+    <tr>
+      <th>Name</th>
+      <th>Required</th>
+      <th>Data type</th>
+      <th>Description</th>
+    </tr>
+    <tr>
+      <td>column</td>
+      <td>No</td>
+      <td>string</td>
+      <td>Column to operate on. Default is '_value'.</td>
+    </tr>
+  </tbody>
+</table>
+
+
+### Example
+
+```php
+->addFirst("_value")
+```
+
+This will result in the following Flux function part:
+
+```
+|> first(column: "_value")
+```
+
+### Extra resources
+
+* [Flux documentation](https://docs.influxdata.com/flux/v0.x/stdlib/universe/first/)

docs/functions/addMax.md

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+# Flux Query Builder Docs
+
+## Functions » addMax()
+
+### Parameters:
+
+<table>
+  <tbody>
+    <tr>
+      <th>Name</th>
+      <th>Required</th>
+      <th>Data type</th>
+      <th>Description</th>
+    </tr>
+    <tr>
+      <td>column</td>
+      <td>No</td>
+      <td>string</td>
+      <td>Column to return maximum values from. Default is '_value'.</td>
+    </tr>
+  </tbody>
+</table>
+
+
+### Example
+
+```php
+->addMax("_value")
+```
+
+This will result in the following Flux function part:
+
+```
+|> max(column: "_value")
+```
+
+### Extra resources
+
+* [Flux documentation](https://docs.influxdata.com/flux/v0.x/stdlib/universe/max/)

docs/functions/addMin.md

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+# Flux Query Builder Docs
+
+## Functions » addMin()
+
+### Parameters:
+
+<table>
+  <tbody>
+    <tr>
+      <th>Name</th>
+      <th>Required</th>
+      <th>Data type</th>
+      <th>Description</th>
+    </tr>
+    <tr>
+      <td>column</td>
+      <td>No</td>
+      <td>string</td>
+      <td>Column to return minimum values from. Default is '_value'.</td>
+    </tr>
+  </tbody>
+</table>
+
+
+### Example
+
+```php
+->addMin("_value")
+```
+
+This will result in the following Flux function part:
+
+```
+|> min(column: "_value")
+```
+
+### Extra resources
+
+* [Flux documentation](https://docs.influxdata.com/flux/v0.x/stdlib/universe/min/)