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+++ b/Samples/README.md	Wed Apr 15 15:46:06 2020 +0200
@@ -0,0 +1,127 @@
+General
+=======
+These samples assume that a recent version of Orthanc is checked out in an
+`orthanc` folder next to the `orthanc-stone` folder. Let's call the top folder
+the `devroot` folder. This name does not matter and is not used anywhere.
+
+Here's the directory layout that we suggest:
+
+```
+devroot/
+ |
+ +- orthanc/
+ |
+ +- orthanc-stone/
+ |
+ ...
+```
+
+ Orthanc can be retrieved with:
+ ```
+ hg clone https://hg.orthanc-server.com/orthanc
+ ```
+ 
+WebAssembly samples
+===================
+
+Building the WebAssembly samples require the Emscripten SDK 
+(https://emscripten.org/). This SDK goes far beyond the simple compilation to
+the wasm (Web Assembly) bytecode and provides a comprehensive library that 
+eases porting native C and C++ programs and libraries. The Emscripten SDK also
+makes it easy to generate the companion Javascript files requires to use a 
+wasm module in a web application.
+
+Although Emscripten runs on all major platforms, Stone of Orthanc is developed
+and tested with the Linux version of Emscripten.
+
+Emscripten runs perfectly fine under the Windows Subsystem for Linux (that is
+the environment used quite often by the Stone of Orthanc team)
+
+**Important note:** The following examples **and the build scripts** will 
+assume that you have installed the Emscripten SDK in `~/apps/emsdk`.
+
+The following packages should get you going (a Debian-like distribution such 
+as Debian or Ubuntu is assumed)
+
+```
+sudo apt-get update 
+sudo apt-get install -y build-essential curl wget git python cmake pkg-config
+sudo apt-get install -y mercurial unzip npm ninja-build p7zip-full gettext-base 
+```
+
+SingleFrameViewer
+-----------------
+
+This sample application displays a single frame of a Dicom instance that can
+be loaded from Orthanc, either by using the Orthanc REST API or through the 
+Dicomweb server functionality of Orthanc.
+
+This barebones sample uses plain Javascript and requires the 
+Emscripten toolchain and cmake, in addition to a few standard packages.
+
+Here's how you can build it: create the following script (for instance, 
+`build-wasm-SingleFrameViewer.sh`) one level above the orthanc-stone repository,
+thus, in the folder we have called `devroot`.
+
+If you feel confident, you can also simply read the following script and 
+enter the commands interactively in the terminal.
+
+```
+#!/bin/bash
+
+if [ ! -d "orthanc-stone" ]; then
+  echo "This script must be run from the folder one level above orthanc-stone"
+  exit 1
+fi
+
+if [[ ! $# -eq 1 ]]; then
+  echo "Usage:"
+  echo "  $0 [BUILD_TYPE]"
+  echo ""
+  echo "  with:"
+  echo "    BUILD_TYPE = Debug, RelWithDebInfo or Release"
+  echo ""
+  exit 1
+fi
+
+# define the variables that we'll use
+buildType=$1
+buildFolderName="`pwd`/out/build-stone-wasm-SingleFrameViewer-$buildType"
+installFolderName="`pwd`/out/install-stone-wasm-SingleFrameViewer-$buildType"
+
+# configure the environment to use Emscripten
+. ~/apps/emsdk/emsdk_env.sh
+
+
+mkdir -p $buildFolderName
+
+# change current folder to the build folder
+pushd $buildFolderName
+
+emcmake cmake -G "Ninja" \
+  -DCMAKE_BUILD_TYPE=$buildType \
+  -DCMAKE_INSTALL_PREFIX=$installFolderName \
+  -DSTATIC_BUILD=ON -DOPENSSL_NO_CAPIENG=ON -DALLOW_DOWNLOADS=ON \
+  ../orthanc-stone/Samples/WebAssembly/SingleFrameViewer
+
+# perform build + installation
+ninja install
+
+# restore the original working folder
+popd
+
+echo "If all went well, the output files can be found in $installFolderName:"
+
+ls $installFolderName```
+```
+
+Simply navigate to the dev root, and execute the script:
+
+```
+./build-wasm-SingleFrameViewer.sh RelWithDebInfo
+```
+
+I suggest that you do *not* use the `Debug` confirmation unless you really 
+need it, for the additional checks that are made will lead to a very long 
+build time and much slower execution (more severe than with a native non-wasm
+target)