Create Creating-Teams.md

Info on methods to create teams, restrictions on name and url, and info on account permissions across teams

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+# Creating Teams
+___
+New teams can be created if the System Administrator has *Enable Team Creation* set to true from the system console.
+
+## Methods to Create a Team
+Teams can be created from the main menu, system home page or team sign in page.
+
+#### Main Menu
+Click the **Three-Dot** menu in Mattermost, then select **Create a New Team**. If this option is not visible in the menu, then the System Administrator has *Enable Team Creation* set to false.
+
+
+#### System Home Page
+Navigate to the web address of your system, `https://domain.com/`. Enter a valid email address and click **Create Team** to be guided through the rest of the set up steps. If this option is not visible on the web page, then the System Administrator has *Enable Team Creation* set to false. It is not necessary to have an existing account on the system in order to create a team from the system home page.
+
+#### Team Sign In Page
+Navigate to the web address of your team, `https://domain.com/teamurl/`. If you are logged in, the web address will open Mattermost and you can create a new team from the main menu. If you are logged out, the web address will direct you to the sign in page where you can click **Create a New Team**. If this option is not visible on the web page, then the System Administrator has *Enable Team Creation* set to false. It is not necessary to have an existing account on the system in order to create a team from the sign in page.
+
+## Team Name and URL Selection
+There are a few details and restrictions to consider when selecting a team name and team URL.
+
+#### Team Name
+This is the display name of your team that appears in menus and headings.
+
+- It can contain any letters, numbers or symbols.
+- It is case sensitive.
+- It must be 4 - 15 characters in length.
+
+#### Team URL
+The team URL is part of the web address that navigates to your team on the system domain, `https://domain.com/teamurl/`. 
+
+- It may contain only lowercase letters, numbers and dashes.
+- It must start with a letter and cannot end in a dash.
+- It must be 4 - 15 characters in length.
+
+If the system administrator has *Restrict Team Names* set to true, the team URL cannot start with the following restricted words: www, web, admin, support, notify, test, demo, mail, team, channel, internal, localhost, dockerhost, stag, post, cluster, api, oauth.
+
+## User Roles on Multiple Teams
+Each user is distinct and owned by a team. A team creator is automatically granted Team Administrator privileges for that team, even if they are a System Administrator on another team. A System Administrator with accounts on multiple teams must grant all their accounts *System Admin* privileges from the system console. To do this, go to the **Main Menu > System Console**, then click **Users** under the *Teams* heading for the team you want to manage.