Add .gitignore for models and logs directories

.gitignore

@@ -0,0 +1,17 @@
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+
+# Models
+app/models/
+models/
+
+# Logs
+logs/
+*.log
+
+# Environment
+.env
+venv/
+env/