add: applied join project

app/controllers/applied_projects_controller.rb

@@ -0,0 +1,13 @@
+class AppliedProjectsController < ApplicationController
+  before_action :require_login
+  def create 
+    @applied_project = Projects::ApplyJoinService.call(current_user, applied_params)
+  rescue Projects::ApplyJoinService::Error => ex
+    render_error(ex.message)
+  end
+
+  private 
+  def applied_params 
+    params.require(:applied_project).permit(:code, :role)
+  end
+end