Add README.md

Author: dongli

README.md

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+# Introduction
+
+fortran-proj is another Fortran bindings for Proj C library. It should provide more concise APIs.
+
+# Usage
+
+```fortran
+use proj
+
+type(proj_type) p
+
+call p%init(latlon_crs(), lcc_crs(36.14387d0, 105.5837d0, 30.0d0, 60.0d0))
+lon = 105.5837
+lat = 36.14387
+call p%transform(lon, lat, x, y)
+```
+
+That's it!
+
+# Contributors
+
+- Li Dong