리텐션 분석 스크립트 최초 커밋

Add retention analysis configuration file
- Introduced `retention_analysis_config.json` to define settings for retention analysis.
- Configured analysis settings including correlation threshold, top features, and minimum sample size.
- Specified retention groups for analysis.
- Listed columns to be excluded from the analysis.
- Defined key metrics for day 0 analysis.
- Set output preferences for saving results in various formats.

retention_analysis_config.json

@@ -0,0 +1,43 @@
+{
+    "analysis_settings": {
+        "correlation_threshold": 0.05,
+        "top_n_features": 20,
+        "min_sample_size": 10
+    },
+    "retention_groups": [
+        "Retained_d0", 
+        "Retained_d1", 
+        "Retained_d2", 
+        "Retained_d3",
+        "Retained_d4", 
+        "Retained_d5", 
+        "Retained_d6", 
+        "Retained_d7+"
+    ],
+    "exclude_columns": [
+        "uid", 
+        "retention_status", 
+        "retention_encoded", 
+        "country", 
+        "nickname", 
+        "auth_id"
+    ],
+    "key_metrics_for_d0_analysis": [
+        "tutorial_complete", 
+        "level_up_count", 
+        "play_time_total",
+        "COOP_entry_count", 
+        "Solo_entry_count", 
+        "death_Monster", 
+        "death_Trap", 
+        "death_PK",
+        "item_gain_Equipment", 
+        "gold_gain_total"
+    ],
+    "output_settings": {
+        "save_csv": true,
+        "save_markdown": true,
+        "save_console_log": true,
+        "timestamp_format": "%Y%m%d_%H%M%S"
+    }
+}