When you come to adding your classes to namespaces you can make this a little bit easier by using the Surround With… functionality within Visual Studio.
The following example is taken from the PlayerMovement.cs file.
Example;
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Collapse your code at the class level

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Select the collapsed code, including any attributes , right-click* and select Surround Width…

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Enter the first few characters of namespace to filter the snippets

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Select namespace from the list of snippets
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Replace MyNameSpace with the desired text

* if you prefer, you can use CTRL + K CTRL + S to launch this menu
See also;
