Create configuration guides

docs/configuration.md

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+# Mattermost Desktop Configuration Guides
+
+## Build-time Configuration
+You can customize and distribute your own Mattermost Desktop application
+by configuring `src/common/config/buildConfig.js`.
+To build the application, please follow
+[Mattermost Desktop Development Guides](./development.md).
+
+### Parameters
+
+#### `defaultTeams`
+`Array<Object(Team)>`
+
+Servers which are initially added to the application.
+They are displayed prior to user-defined servers and users can't modify them.
+
+##### `Team.name`
+`String`
+
+The tab name for the server.
+
+##### `Team.url`
+`String`
+
+The URL for the server.
+
+#### `helpLink`
+`String | null`
+
+The URL to open when clicking "Help->Learn More..." menu item.
+If null is specified, the menu disappears.
+
+#### `enableServerManagement`
+`Boolean`
+
+Whether users can edit servers configuration.
+Specify at least one server for `defaultTeams` when `enableServerManagement` is
+set to false.
+Otherwise, users can't interact with any servers.