Add .pyi file for python type hinting.

src/python/demoparser2.pyi

@@ -0,0 +1,46 @@
+import pandas as pd
+from typing import Dict, Sequence
+
+class DemoParser:
+    def __init__(self, path: str) -> None: ...
+    def parse_header(self) -> Dict[str, str]: ...
+    def parse_convars(self) -> Dict[str, str]: ...
+    def Sequence_game_events(self) -> Sequence[str]: ...
+    def parse_grenades(self) -> pd.DataFrame: ...
+    def parse_chat_messages(self) -> pd.DataFrame: ...
+    def parse_player_info(self) -> pd.DataFrame: ...
+    def parse_item_drops(self) -> pd.DataFrame: ...
+    def parse_skins(self) -> pd.DataFrame: ...
+    def parse_event(
+        self,
+        event_name: str,
+        player: Sequence[str] = [],
+        other: Sequence[str] = [],
+        player_extra: Sequence[str] = [],
+        other_extra: Sequence[str] = [],
+    ) -> pd.DataFrame: ...
+    def parse_events(
+        self,
+        event_name: Sequence[str],
+        player: Sequence[str] = [],
+        other: Sequence[str] = [],
+        player_extra: Sequence[str] = [],
+        other_extra: Sequence[str] = [],
+    ) -> pd.DataFrame: ...
+    def parse_voice(self) -> Dict[str, bytes]: ...
+    def parse_ticks(
+        self,
+        wanted_props: Sequence[str],
+        player: Sequence[str] = [],
+        ticks: Sequence[str] = [],
+    ) -> pd.DataFrame:
+        """Parse the specified props.
+
+        Args:
+            wanted_props (Sequence[str]): The props to parse for each player at each tick.
+            player (Sequence[int]): Sequence of Steam IDs of the players to parse. An empty Sequence means all players.
+            ticks (Sequence[int]): Sequence of ticks to parse. An empty Sequence means all ticks.
+
+        Returns:
+            pd.DataFrame: Dataframe of all the parsed props for each player at each tick.
+        """