Update README.md

README.md

-# ``GitLab::API``
+# GitLab::API
 
-Lightweight implementation of ``GitLab``'s API in Perl.
+Lightweight implementation of [GitLab CE API](https://docs.gitlab.com/ce/api/) in Perl.
 
 ## Quick start
 
@@ -14,5 +14,33 @@ my $gitlab = GitLab::API->new(
 );
 
 my $users  = $gitlab->users();
+
+say "Users in GitLab:";
+foreach my $user (@$users) {
+    say $user->{name};
+}
+
 my $groups = $gitlab->groups(search => "pb161");
-```
\ No newline at end of file
+```
+
+## Documentation
+
+- [official GitLab API documentation](https://docs.gitlab.com/ce/api/)
+- core modules
+    - [`GitLab`](pod-GitLab.md)
+    - [`GitLab::API`](pod-GitLab-API.md)
+- extensions
+    - [`GitLab::Groups`](pod-GitLab-Groups.md)
+    - [`GitLab::Namespaces`](pod-GitLab-Namespaces.md)
+    - [`GitLab::Users`](pod-GitLab-Users.md)
+
+## Dependencies
+
+- [`HTTP::Headers`](https://metacpan.org/pod/HTTP::Headers)
+- [`JSON`](https://metacpan.org/pod/JSON)
+- [`Log::Any`](https://metacpan.org/pod/Log::Any)
+- [`LWP::UserAgent`](https://metacpan.org/pod/LWP::UserAgent)
+- [`LWP::Protocol::https`](https://metacpan.org/pod/LWP::Protocol::https)
+- [`Try::Tiny`](https://metacpan.org/pod/Try::Tiny)
+- [`URI`](https://metacpan.org/pod/URI)
+- [`URI::QueryParam`](https://metacpan.org/pod/URI::QueryParam)
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