Inclusion of Readme

coupler/opc-ua-server/Readme.md

+# Usage of OPC UA server with Beremiz
+
+## Prerequisites
+
+### Installing open62541
+$ git clone https://github.com/open62541/open62541.git
+$ cd open62541/
+$ git submodule update --init --recursive
+$ mkdir build && cd build
+$ cmake -DBUILD_SHARED_LIBS=ON -DCMAKE_BUILD_TYPE=RelWithDebInfo -DUA_NAMESPACE_ZERO=FULL -DUA_ENABLE_AMALGAMATION=ON ..
+$ make
+$ sudo make install
+
+### Copy the open62541.h and open62541.c
+
+If you are developing OPC UA application for LIM2 controller with MOD-IO, then your OPC UA location will be ~/osie/coupler/opc-ua-server/
+
+$ cp ~/open62541/build/open62541.* ~/osie/coupler/opc-ua-server/
+
+### Building your OPC UA server (Cross compilation to ARM architecture from Ubuntu)
+
+$ arm-linux-gnueabihf-gcc open62541.c server.c -o server
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