updated README

README.md

+Field Device Configuration schemas
+==================================
+
+This is the repository for developing XML schema for the reource types defined in oneM2M TS-0022
+
+\<authenticationProfile\>
+\<dataCollection\>
+\<MEFClientRegCfg\>
+\<registration\>
+\<MAFClientRegCfg\>
+\<myCertFileCred\>
+\<trustAnchorCred\>
+
+DCFG-commonTypes-vx_y_0.xsd defines data types common to all resource types
+
+Note: The required xsd files CDT-commonTypes-vx_y_0 can be downloaded from 
+      https://git.onem2m.org/PRO/XSD.git
+      The required xsd files SEC-commonTypes-vx_y_0 can be downloaded from 
+      https://git.onem2m.org/SEC/MAF-MEF.git
+