update README.md.

Signed-off-by: Annie_wang <annie.wangli@huawei.com>
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Annie_wang 2021-11-04 07:34:32 +00:00 committed by Gitee
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@ -85,7 +85,9 @@ For details about the directory of the sample code, see [Board-Level Directory S
### Building and Running
Before the build, configure the **bin** directory of the cross compilation toolchain in the **PATH** environment variable or set **board&#95;toolchain&#95;path** in the **device/st/nucleo&#95;f767zi/liteos&#95;m/config.gni** file to the **bin** directory of the cross compilation toolchain.
In the **OpenHarmony** root directory, run the **hb set** command to set the product path, select **nucleo_f767zi**, and run the **hb build** command to start the build. Example:
In the **OpenHarmony** root directory, run the **hb set** command to set the product path, select **nucleo_f767zi**, and run the **hb build** command to start the build.
Example:
```
user@dev:~/OpenHarmony$ hb set