Fix vcpkg boostrap command. Add CentOS8 build notes.

CentOS8.md

@@ -0,0 +1,63 @@
+# Remote Provisioning Client (RPC)
+
+RPC is an application which enables remote capabilities for AMT, such as as device activation. To accomplish this, RPC communicates with the RPS (Remote Provisioning Server).
+
+The steps below assume the following directory structure where **rpc** is the clone of this repository, **vcpkg** is a clone of the VCPKG tool source and **build** is the RPC build directory. Both vcpkg and build directories will be created in later steps.
+
+```
+\rpc
+  |__vcpkg
+  |__build
+```
+
+# Linux
+
+Steps below are for CentOS8.
+
+## Dependencies
+
+### CMake
+Install CMake.
+    
+```
+sudo yum install cmake
+```
+
+## Build C++ REST SDK
+
+Using a Terminal window with the PATH and devtoolset enabled per the Dependencies.
+
+```
+git clone https://github.com/microsoft/vcpkg.git
+cd vcpkg
+./bootstrap-vcpkg.sh
+./vcpkg install cpprestsdk[websockets]
+```
+
+## Build RPC
+
+Using a Terminal window with the PATH and devtoolset enabled per the Dependencies.
+
+```
+mkdir build
+cd build
+cmake -DCMAKE_TOOLCHAIN_FILE=/rpc/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_BUILD_TYPE=Release ..
+cmake --build .
+```
+
+To build debug:
+```
+cmake -DCMAKE_TOOLCHAIN_FILE=/rpc/vcpkg/scripts/buildsystems/vcpkg.cmake -DCMAKE_BUILD_TYPE=Debug ..
+cmake --build .
+```
+
+## Run RPC
+
+Open a Terminal window.
+
+```
+cd build
+sudo ./rpc --url wss://localhost:8080 --cmd "-t activate --profile profile1"
+```
+
+Use --help for more options.