Update README.md

README.md

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-# r8125-esxi
-Realtek RTL8125 driver for ESXi 6.7
+# Realtek RTL8125 NIC driver for ESXi 6.7
+
+This source code is based on realtek official source, VMware-ESXI-67U3-ODP and VMware-TOOLS-10.2.0-ODP.
+
+Just do these steps:
+- Prepare the building environment, I did it on CentOS 5.3
+- Log in with root, make a folder name 'build' on /, make folder toolchain and vsphere in /build.
+- Copy and extract gcc-4.6.3-2, binutils-2.22, glibc-2.3.4-2.41 to /build/toolchain/src 
+- Compile the toolchain, dest path is /build/toolchain/lin64
+- Extract and copy vmkdrivers-gpl from 67U3-ODP to /build/vsphere
+- Copy build-r8125.sh to /build/vsphere/vmkdrivers-gpl/
+- Copy r8125 folder to /build/vsphere/vmkdrivers-gpl/vmkdrivers/src_9/drivers/net
+- Run build-r8125.sh