Add directories/README for contributions

PiperOrigin-RevId: 323566271
Change-Id: I4ccddea09f5d2ecc2a2e17841693350eec9f7d3a

contrib/README.md

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+# Sandboxed API Integrations/Contributions
+
+This directory contains reusable Sandboxed API integrations with external
+libraries.
+
+## Projects Shipping with Sandboxed API Sandboxes
+
+Project                                 | Home Page                                                        | Integration
+--------------------------------------- | ---------------------------------------------------------------- | -----------
+YARA - The pattern matching swiss knife | [github.com/VirusTotal/yara](https://github.com/VirusTotal/yara) | Bazel

oss-internship-2020/README.md

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+# Sandboxing OSS Internship 2020
+
+With Google offices closed due to the pandemic, this year's interns will be
+doing their internship at Google fully remote (see the
+[blog post](https://blog.google/inside-google/working-google/google-internships-go-virtual-help-open-source/)).
+
+In addition, most of them are working on open-source projects and develop in the
+open.
+
+As part of this effort, the Sandboxed API team decided to host interns as well
+in order to provide reusable sandboxes for open-source libraries.
+
+This directory collects our interns' contributions prior to upstreaming. For
+projects where this is not feasible, we will eventually move the finished
+project into the `contrib` folder directly.