Added docs for data sources

docusaurus/docs/data_global_permissions_groups.md

@@ -0,0 +1,36 @@
+---
+id: data_global_permissions_groups
+title: bitbucketserver_global_permissions_groups
+---
+
+Retrieve a list of groups that have been granted at least one global permission.
+
+## Example Usage
+
+```
+data "bitbucketserver_global_permissions_groups" "all" { }
+```
+
+### Applying a Custom Filter
+
+Find any groups starting with `dev`.
+ 
+```
+data "bitbucketserver_global_permissions_groups" "dev-groups" {
+  filter = "dev"
+}
+```
+
+## Argument Reference
+
+* `filter` - Optional. If specified only group names containing the supplied string will be returned.
+
+## Attribute Reference
+
+* `groups` - List of maps containing `name` and `permission` keys. Available permissions are:
+
+    * `LICENSED_USER`
+    * `PROJECT_CREATE`
+    * `ADMIN`
+    * `SYS_ADMIN`
+