improved autosave + added last opened file

src/config.py

@@ -0,0 +1,27 @@
+import json
+import os.path
+
+
+class Config:
+    LAST_OPENED_FILE = ""
+    AUTOSAVE_INTERVAL = 5 * 60 * 1000
+
+    def __init__(self, path: str):
+        self._path: str = path
+
+        self.load()
+
+    def load(self) -> None:
+        if os.path.exists(self._path):
+            with open(self._path, "r") as f:
+                config = json.load(f)
+
+            self.LAST_OPENED_FILE = config["last_opened_file"]
+            self.AUTOSAVE_INTERVAL = config["autosave_interval"]
+
+    def save(self) -> None:
+        with open(self._path, "w") as f:
+            json.dump({
+                "last_opened_file": self.LAST_OPENED_FILE,
+                "autosave_interval": self.AUTOSAVE_INTERVAL
+            }, f, indent=4)