docs: add markdown description for the generate command

Author: sis0k0

docs/man_pages/project/configuration/generate.md

@@ -0,0 +1,28 @@
+<% if (isJekyll) { %>---
+title: tns generate
+position: 9
+---<% } %>
+# tns generate
+
+
+Usage | Synopsis
+------|-------
+General | `$ tns generate <Schematic Name> [--collection <Collection>] [option=value]`
+
+Modifies the project by executing a specified schematic to it.
+
+### Options
+* `--collection` - specifies the node package to be used as schematics collection. If it's not specified, `@nativescript/schematics` will be used.
+
+### Attributes
+* `<Schematic Name>` - name of the schematic to be executed. The schematic should be specified in the used collection.
+* `<option=value>` - options for executed schematic.
+
+<% if(isHtml) { %>
+### Related Commands
+
+Command | Description
+----------|----------
+[update](update.md) | Updates a NativeScript project to the latest (or specified) version.
+[resources generate icons](resources-generate-icons.md) | Generates icons for Android and iOS.
+[resources generate splashes](resources-generate-splashes.md) | Generates splashscreens for Android and iOS.