Add quick start to README

README.md

@@ -29,6 +29,29 @@ Dataiter optionally uses **Numba** to speed up certain operations. If
 you have Numba installed, Dataiter will use it automatically. It's
 currently not a hard dependency, so you need to install it separately.
 
+## Quick Start
+
+```python
+import dataiter as di
+data = di.read_csv("data/listings.csv")
+data.filter(hood="Manhattan", guests=2).sort(price=1).head()
+.
+        id      hood zipcode guests    sqft price
+     int64    string  string  int64 float64 int64
+  ──────── ───────── ─────── ────── ─────── ─────
+0 42279170 Manhattan   10013      2     nan     0
+1 42384530 Manhattan   10036      2     nan     0
+2 18835820 Manhattan   10021      2     nan    10
+3 20171179 Manhattan   10027      2     nan    10
+4 14858544 Manhattan              2     nan    15
+5 31397084 Manhattan   10002      2     nan    19
+6 22289683 Manhattan   10031      2     nan    20
+7  7760204 Manhattan   10040      2     nan    22
+8 43292527 Manhattan   10033      2     nan    22
+9 43268040 Manhattan   10033      2     nan    23
+.
+```
+
 ## Documentation
 
 https://dataiter.readthedocs.io/