Update Readme.md

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+# Add a library reference (import the library) to your Python project.
 
+To add a library reference to your Python project, you can use the `pip` command. For example, to install the Spire.XLS for Python library, you would run the following command:
+
+```sh
+pip install Spire.Xls
+```
+
+Once the library is installed, you can import it into your Python script using the `import` keyword.