[PATCH v2 1/1] [platforms/devel-riscv]: U500Pkg: Update Readme.md

["Abner Chang" <abner.chang@hpe.com>]

Update Readme.md follow sample platform readme guidance.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Abner Chang <abner.chang@hpe.com>
---
 Platform/RiscV/SiFive/U500Pkg/Readme.md | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/Platform/RiscV/SiFive/U500Pkg/Readme.md b/Platform/RiscV/SiFive/U500Pkg/Readme.md
index 3aaaf77..a073e04 100644
--- a/Platform/RiscV/SiFive/U500Pkg/Readme.md
+++ b/Platform/RiscV/SiFive/U500Pkg/Readme.md
@@ -7,6 +7,38 @@ This is a sample RISC-V EDK2 platform package used agaist SiFive Freedom U500 VC
 <br>
 This package provides librareis and modules which are SiFive U500 platform implementation-specific and incorporate with common RISC-V packages mentioned above.
 
+## Download the sources
+```
+git clone https://github.com/tianocore/edk2-staging.git
+# Checkout "RISC-V" branch
+git clone https://github.com/tianocore/edk2-platforms.git
+# Checkout "devel-riscv" branch
+git clone https://github.com/tianocore/edk2-non-osi.git
+```
+
+## Platform Owners
+Chang, Abner <abner.chang@hpe.com><br>
+Chen, Gilbert <gilbert.chen@hpe.com>
+
+## Platform Status
+Currently the binary built from U500Pkg can boot SiFive Freedom U500 VC707 FPGA to EFI shell with console in/out enabled.
+
+## Linux Build Instructions
+You can build the RISC-V platform using below script, <br>
+`build -a RISCV64 -p Platform/RiscV/SiFive/U500Pkg/U500.dsc -t GCC711RISCV`
+
+## Supported Operating Systems
+Only support to boot to EFI Shell so far
+
+## Known Issues and Limitations
+Only RISC-V RV64 is verified on this platform.
+
+## Related Materials
+- [RISC-V OpenSbi](https://github.com/riscv/opensbi)<br>
+- [SiFive U500 VC707 FPGA Getting Started Guide](https://sifive.cdn.prismic.io/sifive%2Fc248fabc-5e44-4412-b1c3-6bb6aac73a2c_sifive-u500-vc707-gettingstarted-v0.2.pdf)<br>
+- [SiFive RISC-V Core Document](https://www.sifive.com/documentation)
+
+## U500 Platform Libraries and Drivers
 ### OpneSbiPlatformLib
 In order to reduce the dependencies with RISC-V OpenSBI project (https://github.com/riscv/opensbi) and less burdens to EDK2 build process, the implementation of RISC-V EDK2 platform is leverage platform source code from OpenSBI code tree. The "platform.c" under OpenSbiPlatformLib  is cloned from RISC-V OpenSBI code tree (in EDK2 RiscVPkg) and built based on EDK2 build environment.
 
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