Add cmake template for openblas.pc

cmake/openblas.pc.in

@@ -0,0 +1,10 @@
+prefix=@prefix@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: OpenBLAS
+Description: OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version
+Version: @OPENBLAS_VERSION@
+URL: https://github.com/xianyi/OpenBLAS
+Libs: -L${libdir} -lopenblas
+Cflags: -I${includedir}