cmake: fixes for windows

cmake/README.md

Index: cmake/README.md
diff --git a/cmake/README.md b/cmake/README.md
index 0cbd2b369ecf680a9249977cf9f37efbb60ba250..f8a54f33e729816bc826f366eaf69e30f700d9bc 100644
--- a/cmake/README.md
+++ b/cmake/README.md
@@ -6,12 +6,17 @@ not at day-to-day Skia development.
 
 Quickstart
 ----------
-    $ cd skia/cmake
-    $ cmake . -G Ninja     # Other CMake generators should work fine.
-    $ ninja
-    $ ls -l libskia.* example
-    $ ./example
-    $ open example.png
+
+<!--?prettify lang=sh?-->
+
+    git clone https://skia.googlesource.com/skia.git
+    cd skia/cmake
+    cmake . -G Ninja     # Other CMake generators should work fine.
+    ninja
+    ls -l libskia.* example
+    ./example
+    open example.png || xdg-open example.png
+
 If that works, you should see "Hello World!" with a green-to-purple gradient.
 
 Currently supported platforms
@@ -20,4 +25,11 @@ Currently supported platforms
 
 Currently maybe-kinda-working platforms
 ---------------------------------------
-  - x86-64 Mac OS X, Ubuntu 15.04
+  - x86-64 Mac OS X
+  - x86-64 Ubuntu 15.04
+  - x86-64 Windows 10, with extra caveats:
+      * Compiles against DirectWrite, not GDI, for fonts
+      * Configure with `cmake . -G "Visual Studio 14 2015"` .
+      * Compile with `cmake --build . --config Release` .
+      * Still has too many warnings.
+      * Poorly tested as yet.