Merge pull request #2 from cilium/readme

Initial readme

README.md

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-# tetragon
-# tetragon
+# Tetragon
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+**_COMING SOON_**
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+Cilium’s new **Tetragon** component enables powerful, **eBPF-based Security Observability and Runtime Enforcement**. 
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+Tetragon detects and is able to respond in real time to security-significant events, such as
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+* Process execution events
+* Changes to privileges and capabilities 
+* I/O activity including network & file access
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+When used in a Kubernetes environment, Tetragon is Kubernetes-aware - that is, it understands Kubernetes identities such as namespaces, pods and so-on - so that security event detection can be configured in relation to individual workloads.
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