ADD repository languages percentage api

app/services/gitea/repository/languages/list_service.rb

@@ -0,0 +1,39 @@
+# Get languages and number of bytes of code written
+class Gitea::Repository::Languages::ListService < Gitea::ClientService
+  attr_reader :owner, :repo, :token
+
+  # owner: owner of the repo
+  # repo: the name of repository
+  # token: token of gitea user
+  # eq: Gitea::Repository::Languages::ListService.call(@owner.identifier,
+  # @project.identifier, current_user&.gitea_token)
+  def initialize(owner, repo, token)
+    @owner = owner
+    @repo  = repo
+    @args  = token
+  end
+
+  def call
+    response = get(url, params)
+
+    status, message, body = render_response(response)
+    json_format(status, message, body)
+  end
+
+  private
+  def params
+    {}.merge(token: token)
+  end
+
+  def url
+    "/repos/#{owner}/#{repo}/languages".freeze
+  end
+
+  def json_format(status, message, body)
+    case status
+    when 200 then success(body)
+    else
+      error(message, status)
+    end
+  end
+end