readme: modify badge and link, relicense project from RustSBI team

Signed-off-by: Zhouqi Jiang <[email protected]>

README.md

@@ -1,10 +1,13 @@
 # XuanTie
 
-Low level access to T-Head XuanTie RISC-V processors
+Low level access to T-Head XuanTie RISC-V processors.
 
-[![crates.io](https://img.shields.io/crates/v/xuantie.svg)](https://crates.io/crates/xuantie)
-[![Documentation](https://docs.rs/xuantie/badge.svg)](https://docs.rs/xuantie)
-![License](https://img.shields.io/crates/l/xuantie.svg)
+| Name | Crates | Documentation | License |
+|:-----|:-------|:--------------|:--------|
+| `xuantie-riscv` | [![crates.io](https://img.shields.io/crates/v/xuantie-riscv.svg)](https://crates.io/crates/xuantie-riscv) | [![Documentation](https://docs.rs/xuantie-riscv/badge.svg)](https://docs.rs/xuantie-riscv) | 
+![License](https://img.shields.io/crates/l/xuantie-riscv.svg)
+| `xuantie-riscv-rt` | [![crates.io](https://img.shields.io/crates/v/xuantie-riscv-rt.svg)](https://crates.io/crates/xuantie-riscv-rt) | [![Documentation](https://docs.rs/xuantie-riscv-rt/badge.svg)](https://docs.rs/xuantie-riscv-rt) | 
+![License](https://img.shields.io/crates/l/xuantie-riscv-rt.svg)
 
 ## Minimum supported Rust version
 
@@ -19,7 +22,7 @@ We welcome contribution! Please send an issue or pull request if you are ready.
 Mulan PSL v2
 
 ```
-Copyright (c) 2021 Luo Jia
+Copyright (c) 2021 RustSBI Team
 Rust-XuanTie-Support is licensed under Mulan PSL v2.
 You can use this software according to the terms and conditions of the Mulan PSL v2.
 You may obtain a copy of Mulan PSL v2 at: