add t-head smart-evb bsp, and risc-v cpu e906

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diff --git a/bsp/thead-smart/README.md b/bsp/thead-smart/README.md
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+# T-HEAD SMART-EVB Introduction
+SMART-EVB is a development board provided by T-HEAD, based on FPGA to provide implementation, integrating T-HEAD's RISC-V CPU (eg. E902/E906/C906) and C-SKY CPU (eg. E805/E804/E803/E802 ), integrates basic peripheral resources such as GPIO/TIMER/UART/RAM.
+
+##The main resources on board are as follows:
+1. SMART-EVB for E906/E906F/E906FD
+| res | description |
+| -- | -- |
+|ISA | RISCV |
+|CPU | E906  |
+|FREQ| 20MHz |
+|SRAM| 768KB |
+
+
+2. SMART-EVB for E804/E804F/E804D
+| res | description |
+| -- | -- |
+|ISA | C-SKY |
+|CPU | E804  |
+|FREQ| 20MHz |
+|SRAM| 768KB |
+
+
+# Compile T-HEAD BSP
+SMART-EVB BSP supports GCC compiler, the version information is:
+1. SMART-EVB for E906/E906F/E906FD
+| IDE/Compiler| version|
+| - | - |
+| GCC | gcc version 8.4.0 (C-SKY RISCV Tools V1.9.6 B20200616) |
+
+# run smart-evb bsp
+1. Connect JTAG
+2. Connect the serial port
+3. riscv64-unknown-elf-gdb rtthread-e906f.elf
+
+run log as follows:
+```
+ \ | /
+- RT -     Thread Operating System
+ / | \     4.0.3 build Sep  2 2020
+ 2006 - 2020 Copyright by rt-thread team
+msh >
+```
+
+
+