guides/http: document Java Jetty client integration

content/guides/http/java/_index.md

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+---
+title: "Java"
+date: 2019-02-04T00:25:17-08:00
+draft: false
+class: "integration-page"
+aliases: [/integrations/http/java]
+logo: /images/java.png
+---
+
+OpenCensus Java provides integrations for the following Java HTTP frameworks:
+{{% children %}}

content/guides/http/java/jetty/_index.md

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+---
+title: "Jetty"
+date: 2019-02-04T00:25:17-08:00
+draft: false
+class: "integration-page"
+aliases: [/integrations/http/java/jetty]
+logo: /images/jetty-header-logo.png
+---
+
+Jetty is a popular Java HTTP framework from the Eclipse foundation  https://www.eclipse.org/jetty/
+
+OpenCensus is integrated with Jetty, for the following parts:
+
+{{% children %}}
+
+### References
+
+Resource|URL
+---|---
+Jetty project|https://www.eclipse.org/jetty/documentation/