The Nuxeo defaultly provides Title and Description in its layout. I suggest you to load ur own layout in order to override the default layout given by nuxeo. So according to your need, create a "layout-contrib.xml" as below.
<extension target="org.nuxeo.ecm.platform.forms.layout.WebLayoutManager"
point="layouts">
<layout name="ur_layout_name">
<templates>
<template mode="any">/layouts/layout_default_template.xhtml
</template>
</templates>
<rows>
<row>
<widget>Montant</widget>
</row>
<row>
<widget>client</widget>
</row>
<!-- As many fields u want-->
</rows>
<widget name="Montant" type="int">
<labels>
<label mode="any">Montant</label>
</labels>
<translated>false</translated>
<fields>
<field>lds:intField</field>
</fields>
</widget>
<widget name="client" type="text">
<labels>
<label mode="any">Client</label>
</labels>
<translated>false</translated>
<fields>
<field>lds:textField</field>
</fields>
</widget>
</layout>
</extension>
We need to define our own schema which defines few datatypes. So declare ur schema in core-types-contrib.xml.
<schema name="layout_demo_schema" prefix="lds" src="schema/layout_demo_schema.xsd" />
Define the datatypes which are needed. For example, here we want int, text, date field etc. So create ur schema layout_demo_schema.xsd and define these datatypes.
<xs:element name="intField" type="xs:int" />
<xs:element name="textField" type="xs:string" />
Don't forget to declare your layout in ui-types-contrib.xml.
<layouts mode="any">
<layout>ur_layout_name</layout>
</layouts>
Even I wanted a similar customized folder type metadata and have a look at the attached image how i achieved. That's all, its easy to create custom fields in nuxeo and to play with it.
