Create display code.md

Author: codehariom

display code.md

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+The `st.echo()` function in Streamlit is used to display both the code and its output. In the provided example:
+
+    with st.echo()
+is a context manager that tells Streamlit to echo the code inside it.
+
+    st.write('Code will be executed and printed')
+is the code inside the `with st.echo():` block, and it will be executed and printed along with its output.