diff --git a/src/read_sequencing/__init__.py b/src/read_sequencing/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..b03b3e1196a1f4953679709027bd08f192f60548
--- /dev/null
+++ b/src/read_sequencing/__init__.py
@@ -0,0 +1,3 @@
+"""Placeholder package."""
+
+__version__ = '0.1.0'
diff --git a/src/read_sequencing/cli.py b/src/read_sequencing/cli.py
new file mode 100644
index 0000000000000000000000000000000000000000..8451c47a635776be1c403cc9afedf6ba569ebe80
--- /dev/null
+++ b/src/read_sequencing/cli.py
@@ -0,0 +1,53 @@
+import argparse
+from read_sequencing import read_sequencing
+
+
+def parse_args() -> argparse.Namespace:
+    """Parse CLI arguments.
+
+    Returns:
+        Parsed CLI arguments.
+    """
+
+    # initiate parser
+    parser = argparse.ArgumentParser(description='Simulate the Sequencing of Reads')
+
+    # add arguments
+    parser.add_argument('--frag_file_name',
+                        type=str,
+                        help='input file name')
+
+    parser.add_argument('--output_file_name',
+                        type=str,
+                        help='output file name')
+
+    parser.add_argument('--num_reads',
+                        type=int,
+                        help='desired number of reads')
+
+    parser.add_argument('--read_len',
+                        type=int,
+                        help='length of each read')
+
+    return parser.parse_args()
+
+
+def main() -> None:
+    """Main function.
+
+    Interprets the arguments from the commandline,
+    Runs the functions read_sequencing.
+    """
+
+    args = parse_args()
+    read_sequencing(frag_file_name=args.frag_file_name,
+                    output_file_name=args.output_file_name,
+                    num_reads=args.num_reads,
+                    read_len=args.read_len)
+
+
+if __name__ == '__main__':
+    """Initiates main.
+    Calls main function only if run from commandline, but not if imported.
+    """
+    main()
diff --git a/src/read_sequencing.py b/src/read_sequencing/read_sequencing.py
similarity index 100%
rename from src/read_sequencing.py
rename to src/read_sequencing/read_sequencing.py