[dts] [dts-announce] DTS 21.02 released

[Tu, Lijuan]

A new release aligned with DPDK 21.02 is available:
	https://git.dpdk.org/tools/dts/snapshot/dts-21.02.tar.xz

Documents are reworked as following: 
	http://doc.dpdk.org/dts/gsg/index.html

	1. Quick start guide
		1.1. Introduction
		1.2. System Requirements
		1.3. Running DTS
		1.4. Check Test Result
	2. User Guide
		2.1. Introduction
		2.2. System Requirements
		2.3. Usage
		2.4. Test Result
		2.5. Practice with TRex
		2.6. Practice with IxExplorer
		2.7. Practice for igb_uio

Programmers' Guide is planned for next release.