Added notes about JMESPath to the KB

knowledge base/jmespath.md

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+# JMESPath
+
+## TL;DR
+
+```sh
+# Filter elements in a list.
+az devops user list \
+  --org https://dv.azure.com/organizationName \
+  --query "\
+    items[? \
+      startsWith(user.principalName, 'yourNameHere') && \
+      \! contains(accessLevel.licenseDisplayName, 'Test plans') \
+    ].user.displayName"
+```
+
+## Further readings
+
+- [Website]
+
+[specifications]: https://jmespath.org/specification.html
+[website]: https://jmespath.org/