Add README.

README.md

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+#Go OpenCV binding
+
+## Why fork?
+Original project (https://code.google.com/p/go-opencv) looks abandoned. Therefore, I decide to fork it and host it on Github, so that others can help to maintain this package.
+
+## TODOs
+- More details doc
+- Implement more bindings
+
+## Install
+
+Linux
+- install Go1 and OpenCV
+- go get code.google.com/p/go-opencv/trunk/opencv
+- cd ${GoOpenCVRoot}/trunk/samples && go run hellocv.go
+
+Windows
+- install Go1 and MinGW
+- install OpenCV-2.4.x to MinGW dir
+  - libopencv*.dll --> ${MinGWRoot}\bin
+  - libopencv*.lib --> ${MinGWRoot}\lib
+  - include\opencv --> ${MinGWRoot}\include\opencv
+  - include\opencv2 --> ${MinGWRoot}\include\opencv2
+- go get code.google.com/p/go-opencv/trunk/opencv
+- cd ${GoOpenCVRoot}/trunk/samples && go run hellocv.go