added filter function for projects

functions/filter_projects.py

@@ -0,0 +1,13 @@
+import pandas as pd
+
+
+def contains_code(crs_codes, code_list):
+    codes = str(crs_codes).split(';')
+    return any(code in code_list for code in codes)
+
+def filter_projects(df, crs3_list):
+    filtered_crs_df = df[df['crs_3_code'].apply(lambda x: contains_code(x, crs3_list))]
+
+    return filtered_crs_df
+    
+