Added functions section

Author: alcampag

app-dev/cloud-native/functions/README.md

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+# Functions
+ 
+OCI Functions
+
+ 
+# Table of Contents
+ 
+1. [Team Publications](#team-publications)
+2. [Useful Links](#useful-links)
+ 
+## Team Publications
+
+- [Building a minimal and secure container for serverless functions](https://medium.com/@comes94/building-a-minimal-and-secure-container-for-serverless-functions-with-micronaut-and-graalvm-4765da26e6a8)
+ 
+
+## Useful Links
+
+- [Functions sample repository](https://github.com/oracle-samples/oracle-functions-samples)
+- [Functions quickstart](https://docs.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsquickstartguidestop.htm)
+
+ 
+# License
+ 
+Copyright (c) 2023 Oracle and/or its affiliates.
+ 
+Licensed under the Universal Permissive License (UPL), Version 1.0.
+
+See [LICENSE](https://github.com/oracle-devrel/technology-engineering/blob/main/application-development/cloud-native/approach-workshop/LICENSE) for more details.