Create Placeholders, help, and options.md

Author: codehariom

Placeholders, help, and options.md

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+These Streamlit snippets demonstrate various functionalities:
+
+**Replace any single element:**
+
+    element = st.empty()
+creates an empty placeholder element.
+
+    element.line_chart(...)
+replaces the empty element with a line chart.
+
+    element.text_input(...)
+replaces the previous element with a text input field.
+
+**Insert out of order:**
+
+    elements = st.container()
+   creates a container for elements.
+
+    elements.line_chart(...)
+inserts a line chart into the container.
+
+    st.write("Hello")
+writes "Hello" outside of the container.
+
+    elements.text_input(...)
+appears above "Hello" within the container.
+
+**Other Streamlit functions:**
+
+    st.help(pandas.DataFrame)
+displays help information for the Pandas DataFrame.
+
+    st.get_option(key)
+retrieves the value of a Streamlit option.
+
+    st.set_option(key, value)
+sets the value of a Streamlit option.
+
+    st.set_page_config(layout='wide')
+sets page configuration options like layout.
+
+    st.experimental_show(objects)
+displays experimental Streamlit objects.
+
+    st.experimental_get_query_params()
+retrieves query parameters from the URL.
+
+    st.experimental_set_query_params(**params)
+sets query parameters in the URL.