add readme

README.md

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+# Template match with gray model(ncc)
+
+## highlights:
+ 1. original code based [Fastest_Image_Pattern_Matching](https://github.com/DennisLiu1993/Fastest_Image_Pattern_Matching), you can checkout tag [v1.0](https://github.com/SurfaceMan/gray_match/releases/tag/v1.0) for more details.
+ 2. refactor simd match process with opencv [Universal intrinsics](https://docs.opencv.org/4.x/df/d91/group__core__hal__intrin.html), have be tested on x86_64(sse),arm(neon),LoongArch(lsx).
+ 3. support model save/load as binary file
+ 4. provide pure c interface
+ 
+## usage:
+all you need can be found in [main.cpp](main.cpp)
+
+## gallery:
+![sample](img/result.png)
+
+
+