feat(provider): add teams data-source

Closes #13

docs/data-sources/teams.md

@@ -0,0 +1,50 @@
+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "forgejo_teams Data Source - terraform-provider-forgejo"
+subcategory: ""
+description: |-
+  Use this data source to retrieve information about existing forgejo teams belonging to an organization.
+---
+
+# forgejo_teams (Data Source)
+
+Use this data source to retrieve information about existing forgejo teams belonging to an organization.
+
+## Example Usage
+
+```terraform
+data "forgejo_organizations" "main" {}
+
+data "forgejo_teams" "main" {
+  for_each = toset([for org in data.forgejo_organizations.main.elements :
+    org.name
+  ])
+
+  organization_name = each.key
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `organization_name` (String) The name of the organization the teams are a part of.
+
+### Read-Only
+
+- `elements` (Attributes List) The list of teams for an organization. (see [below for nested schema](#nestedatt--elements))
+
+<a id="nestedatt--elements"></a>
+### Nested Schema for `elements`
+
+Read-Only:
+
+- `can_create_org_repo` (Boolean) Whether members of this team can create repositories that will belong to the organization.
+- `description` (String) A description string.
+- `id` (Number) The identifier of the team.
+- `includes_all_repositories` (Boolean) Whether members of this team can access all the repositories that belong to the organization.
+- `name` (String) The team's name are a part of.
+- `permission` (String) The members' permission level on the organization.
+- `units` (List of String) The list of units permissions.
+- `units_map` (Map of String) The map of units permissions and their level.