init readme:

* closes #1

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+# Build under Ubuntu
+
+```sudo apt install software-properties-common wget
+wget -O - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add -
+sudo apt-add-repository 'deb http://apt.llvm.org/xenial/ llvm-toolchain-xenial-4.0 main'
+sudo apt update
+sudo apt install build-essential git clang-4.0 llvm-4.0-dev cmake zlib1g-dev
+git clone https://github.com/programmerjake/vulkan-cpu.git
+cd vulkan-cpu
+mkdir build
+cd build
+cmake .. -DCMAKE_CXX_COMPILER="`which clang++-4.0`" -DCMAKE_C_COMPILER="`which clang-4.0`" -DCMAKE_BUILD_TYPE=Debug
+make
+```
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