Add README.md.

Author: XhmikosR

README.md

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+# jpegoptim for Windows
+
+This is just my own project files for easy building of jpegoptim with mozjpeg and MSVC 2015.
+Currently only x64 is targeted.
+
+## Notes:
+
+* MultiThreaded; no need for MSVC Runtime to be installed
+* Uses LTCG
+* Runs on Vista and newer
+
+## Build Instructions
+
+1. Clone the repository
+2. Init submodules with `git submodule init` and `git submodule update --recursive`. Alternatively you can use `git clone --recursive https://github.com/XhmikosR/jpegoptim-windows.git` when cloning this repository.
+2. Download and install MSVC 2015 (any edition)
+3. Place `nasm.exe` somewhere into your `PATH`
+4. Open `jpegoptim.sln` and build