Update README

README.md

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-# arfima-sim-py
-Implementation of ARFIMA process with an aim to simulate series.
+# ARFIMA
+
+Python implementation of ARFIMA process with an aim to simulate series.
+
+## Typical usage
+
+```python
+import arfima
+
+series = arfima.arfima([], 0.3, [], 2**16, warmup=2**16)
+```
+
+The code snippet above would generate time series of ARFIMA(0, 0.3, 0)
+process. To simulate process with AR or MA terms simply pass the
+coefficients as arguments:
+
+```python
+series = arfima.arfima([0.3, 0.2], 0.15, [0.5], 2**16, warmup=2**16)
+```
+
+This would simulate time series of ARFIMA(2, 0.15, 1) process with given
+parameters.