add: issues description and journals notes validate

app/forms/journals/create_form.rb

@@ -0,0 +1,7 @@
+class Journals::CreateForm
+  include ActiveModel::Model
+  
+  attr_accessor :notes
+
+  validates :notes, length: { maximum: 65535, too_long: "不能超过65535个字符"}
+end

app/forms/journals/update_form.rb

@@ -0,0 +1,8 @@
+class Journals::UpdateForm
+  include ActiveModel::Model
+
+  attr_accessor :notes
+
+  validates :notes, length: { maximum: 65535, too_long: "不能超过65535个字符"}
+
+end