added simple sqrt

Author: Pyrolistical

.gitignore

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+*.dll
+*.dll.obj
+*.lib
+*.pdb

requirements.txt

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+cffi==1.15.1

simple.py

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+from cffi import FFI
+
+cffi = FFI()
+cffi.cdef(
+    """
+      double sqrt(double x);
+    """
+)
+
+import os
+
+simple = cffi.dlopen(os.path.abspath("simple.dll"))
+
+print(simple.sqrt(2))

simple.zig

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+export fn sqrt(x: f64) f64 {
+    return @sqrt(x);
+}