added usecase section

docs/use/affinity.md

@@ -33,6 +33,14 @@ The following table provides details about the different elements involved in se
 |**Operator**|The operator field specifies how a label's values match a resource, such as a Pod or node. It establishes the logical condition to determine if a resource satisfies the affinity or anti-affinity rule.</br></br>The following are all logical operators you can use in the operator field:</br><ul><li>**In**: Matches label values in a list</li><li>**NotIn**: Matches label values not in a list.</li><li>**Exists**: Matches when a label key exists, regardless of its value.</li><li>**DoesNotExist**: Matches when a label key does not exist.</li></ul>|When using the **In** and **NotIn** operators, you have to provide the values for the key as well.|
 |**Values**|The values are the specific label values that must match the key for the affinity rule to apply.|Here are some examples for **values**:</br><ul><li>s2</li><li>database</li><li>production</li><li>custom values</li></ul>|
 
+## Use cases for affinity
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+Here are some detailed use cases for affinity that showcase its various applications and benefits.
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