doc: add initial README

Author: JakobJingleheimer

README.md

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+# Test Runner team
+
+This repository is for proposing & planning upcoming features, tracking meetings, and triaging issues.
+
+This repository is NOT for reporting issues with existing features (report those in https://github/com/nodejs/node/issues).
+
+Discussions: discuss nuances to feature proposals
+
+Issues: plan meetings & specific, targeted discussions
+
+Pull Requests: propose & plan features, add minuting minutes
+
+## Active Members
+
+* Aviv Keller [@avivkeller](https://github.com/avivkeller)
+* Colin Ihrig [@cjihrig](https://github.com/cjihrig)
+* Jacob Smith [@JakobJingleheimer](https://github.com/JakobJingleheimer) (chair)
+* Moshe Atlow [@MoLow](https://github.com/MoLow)
+* Pietro Marchini [@pmarchini](https://github.com/pmarchini)