Add csv reader

Signed-off-by: junjie.jiang <junjie.jiang@zilliz.com>

__init__.py

@@ -0,0 +1,4 @@
+from .read_csv import ReadCSV
+
+def csv_reader(*args, **kwargs):
+    ReadCSV(*args, **kwargs)

read_csv.py

@@ -0,0 +1,20 @@
+import csv
+from towhee.operator import PyOperator
+
+
+class ReadCSV(PyOperator):
+    """
+    Wrapper of python csv: https://docs.python.org/3.8/library/csv.html
+    """
+    def __init__(self, f_path: str, newline='', dialect='excel', **fmtparams):
+        self._f_path = f_path
+        self._newline = newline
+        self._dialect = dialect
+        self._fmtparams = fmtparams
+
+    def __call__(self):
+        with open(self._f_path, newline=self._newline) as f:
+            reader = csv.reader(f, self._dialect, **self._fmtparams)
+            # skip header
+            next(reader)
+            yield from reader