Added sidebar info

.github/FUNDING.yml

@@ -0,0 +1,3 @@
+github: giswqs
+custom:
+    - buymeacoffee.com/giswqs

apps/housing.py

@@ -161,7 +161,8 @@ def join_attributes(gdf, df, category):
         new_gdf = gdf.merge(df, left_on="STUSPS", right_on="STUSPS", how="outer")
     elif category == "national":
         if "geo_country" in df.columns.values.tolist():
-            df["country"] = "United States"
+            df["country"] = None
+            df.loc[0, "country"] = "United States"
         new_gdf = gdf.merge(df, left_on="NAME", right_on="country", how="outer")
     elif category == "metro":
         new_gdf = gdf.merge(df, left_on="CBSAFP", right_on="cbsa_code", how="outer")

multiapp.py

@@ -61,3 +61,19 @@ class MultiApp:
 
         st.experimental_set_query_params(**app_state)
         functions[titles.index(title)]()
+
+        st.sidebar.title("Contribute")
+        st.sidebar.info(
+            "This an open source project and you are very welcome to **contribute** your awesome "
+            "comments, questions, resources and apps as "
+            "[issues](https://github.com/giswqs/streamlit-geospatial/issues) of or "
+            "[pull requests](https://github.com/giswqs/streamlit-geospatial/pulls) "
+            "to the [source code](https://github.com/giswqs/streamlit-geospatial). "
+        )
+        st.sidebar.title("About")
+        st.sidebar.info(
+            """
+            This app is maintained by Qiusheng Wu. You can learn more about me at
+            [wetlands.io](https://wetlands.io) or [GitHub.com](https://github.com/giswqs).
+        """
+        )