OMP version comparable runtime to mpi

PoissonSolver/2D-omp/README.md

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+# C source skeleton
+
+## Build
+
+1. Configure the toolchain and additional options in `config.mk`:
+```
+# Supported: GCC, CLANG, ICC
+TAG ?= GCC
+ENABLE_OPENMP ?= false
+
+OPTIONS +=  -DARRAY_ALIGNMENT=64
+#OPTIONS +=  -DVERBOSE_AFFINITY
+#OPTIONS +=  -DVERBOSE_DATASIZE
+#OPTIONS +=  -DVERBOSE_TIMER
+```
+
+The verbosity options enable detailed output about affinity settings, allocation sizes and timer resolution.
+
+
+2. Build with:
+```
+make
+```
+
+You can build multiple toolchains in the same directory, but notice that the Makefile is only acting on the one currently set.
+Intermediate build results are located in the `<TOOLCHAIN>` directory.
+
+To output the executed commands use:
+```
+make Q=
+```
+
+3. Clean up with:
+```
+make clean
+```
+to clean intermediate build results.
+
+```
+make distclean
+```
+to clean intermediate build results and binary.
+
+4. (Optional) Generate assembler:
+```
+make asm
+```
+The assembler files will also be located in the `<TOOLCHAIN>` directory.