first init

README.md

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+# GMath
+a header only simple matrix operation in c
+
+## Quick start
+put the `gmath.h` in your project directory and add these lines in your project file
+```c
+#define GMATH_IMPLEMENTATION
+#include "gmath.h"
+```
+
+## Contribution
+
+The project can be found and issue can be oppened at : https://git.herisson.ovh/tonitch/gmath.h