Reorganize julia directory and add README.

julia/README

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+Contents
+========
+
+* Installing Julia
+* Installing StarPU module for Julia
+* Running Examples
+
+Installing Julia
+----------------
+Julia version 1.3+ is required and can be downloaded from
+https://julialang.org/downloads/.
+
+
+Installing StarPU module for Julia
+----------------------------------
+First, build the jlstarpu_c_wrapper library:
+
+$ make
+
+Then, you need to add the lib/ directory to your library path and the julia/
+directory to your Julia load path:
+
+$ export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD/lib
+$ export JULIA_LOAD_PATH=$JULIA_LOAD_PATH:$PWD
+
+This step can also be done by sourcing the setenv.sh script:
+
+$ . setenv.sh
+
+Running Examples
+----------------
+
+You can find several examples in the examples/ directory.
+
+For each example X, three versions are provided:
+
+- X.c: Original C+starpu code
+- X_native.jl: Native Julia version (without StarPU)
+- X.jl: Julia version using StarPU
+
+
+To run the original C+StarPU code:
+$ make cstarpu.dat
+
+To run the native Julia version:
+$ make julia_native.dat
+
+To run the Julia version using StarPU:
+$ make julia_generatedc.dat
+
+
+
+

julia/setenv.sh

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+export JULIA_LOAD_PATH=$JULIA_LOAD_PATH:$PWD
+
+if [ `uname` == "Darwin" ]; then
+    export DYLD_LIBRARY_PATH=$DYLD_LIBRARY_PATH:$PWD/lib/
+else
+    export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$PWD/lib/
+fi