Merge pull request #27 from termoshtt/example

Add example usage

Author: termoshtt

example/README.md

@@ -0,0 +1,25 @@
+Example of rust-numpy
+----------------------
+
+- Prerequirement
+
+```
+sudo pip3 install -r requirements.txt
+```
+
+- Build
+
+```
+python3 setup.py develop --user
+```
+
+- Run
+
+```python
+import numpy as np
+import rust_ext
+
+a = np.array([0.0, 1.0])
+b = np.array([2.0, 3.0])
+rust_ext(2.0, a, b)
+```