Add mingw README

README-MINGW.md

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+GDC should build for MINGW and MINGW64 targets, however not much
+testing has been done.
+
+## Building ##
+
+The following patches are required for binutils / gcc to fix TLS support:
+ * https://github.com/venix1/MinGW-GDC/blob/master/patches/mingw-tls-binutils-2.23.1.patch
+ * https://github.com/venix1/MinGW-GDC/blob/master/patches/mingw-tls-gcc-4.8.patch
+
+This patch is required to fix a bug in GCC buildscripts:
+ * https://github.com/venix1/MinGW-GDC/blob/master/patches/gcc/0001-Remove-fPIC-for-MinGW.patch
+
+## SEH ##
+GCC supports SEH for Windows 64 bit targets, but GDC has not been tested with SEH
+enabled. It also does not compile right now because no SEH personality routine has
+been written yet (__gdc_personality_seh0).
+
+Configure gcc with --enable-sjlj-exceptions to use SJLJ execptions for win64 targets.
+DWARF exceptions are untested.