Add minutes and issue template for wg meetings (#692)

Refs: #689

doc/templates/build-wg-meeting-0000-00-00.md

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+# Node.js Foundation Build WG Meeting YYYY-MM-DD
+
+[GitHub issue](
+[Meeting video](
+[Previous meeting](
+
+Next meeting: DD MMM YYYY
+
+## Present
+- <!-- Add yourself if present-->
+- Member (@member)
+
+## Standup
+
+- Member
+  - Work done
+
+## Agenda
+
+- Issue name [#000](https://github.com/nodejs/build/issues/000)
+
+## Minutes
+
+### Issue name [#000](https://github.com/nodejs/build/issues/000)
+- <!-- Notes -->
+
+
+## Questions
+
+- <!-- Questions from IRC, the Issue, or ??? -->
+

doc/templates/wg-meeting-issue-template.md

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+### When
+
+Apr 18, 2017 4 PM EST - [time in your timezone](https://www.timeanddate.com/worldclock/fixedtime.html?msg=Node.js+Build+WG+Meeting&iso=20170418T20&p1=1440&ah=1)
+
+
+### Where
+- [Hangouts on Air, for participants](
+- [Youtube stream, for viewers](
+- [events page](https://www.youtube.com/my_live_events?filter=scheduled)
+- [Minutes document](
+- [Previous meeting](
+
+### Agenda
+
+Extracted from `wg-agenda`
+[issues](https://github.com/nodejs/build/issues?q=is%3Aopen+is%3Aissue+label%3Awg-agenda)
+and [pull
+requests](https://github.com/nodejs/build/pulls?q=is%3Aopen+label%3Awg-agenda+is%3Apr)
+from this repo.
+
+* Issue name #000
+
+
+All welcome of course, primarily @nodejs/build focused but we're happy to expand.
+
+Please 👍 if you can make the meeting, and 👎 if you cannot.