docs(TRIAGING): Initial doc about triaging issues in Angular

Author: tbosch

TRIAGING.md

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+# Triage new issues/PRs on github
+
+This document shows the steps the Angular team is using to triage issues.
+The labels are used later on for planning releases.
+
+## Tips ##
+
+* install [github pr helper extension](https://github.com/petebacondarwin/github-pr-helper) and become 356% more productive
+* Label "resolution:*"
+    * these tags can be used for labeling a closed issue/PR with a reason why it was closed. (we can add reasons as we need them, right there are only a few rejection reasons. it doesn't make sense to label issues that were fixed or prs that were merged)
+
+
+## Process ##
+
+1. Open list of [non triaged issues](https://github.com/angular/angular.js/issues?direction=desc&milestone=none&page=1&sort=created&state=open)
+1. Assign yourself: Pick an issue that is not assigned to anyone and assign it to you
+1. Assign milestone:
+    * "Docs only" milestone - for documentation PR -> **Done**.
+    * Current/next milestone - regressions
+    * 1.2.x - everything else
+1. Label "GH: *" (to be automated via Mary Poppins)
+    * PR - issue is a PR
+    * issue - otherwise 
+1. Bugs:
+    * Label "Type: Bug"
+    * Label "Type: Regression" - if the bug is a regression
+    * Duplicate? - Check if there are comments pointing out that this is a dupe, if they do exist verify that this is indeed a dupe and close it and go to the last step
+    * Reproducible? - Steps to reproduce the bug are clear, if not ask for clarification (ideally plunker or fiddle)
+    * Reproducible on master? - http://code.angularjs.org/snapshot/
+
+1. Non bugs:
+    * Label "Type: Feature" or "Type: Chore"
+    * Label "needs: breaking change" - if needed
+    * Understandable? - verify if the description of the request is clear. if not ask for clarification
+    * Goals of angular core? - Often new features should be implemented as a third-party module rather than an addition to the core.
+
+1. Label "component: *"
+    * In rare cases, it's ok to have multiple components. 
+1. Label "impact: *"
+   * small - obscure issue affecting one or handful of developers
+   * medium - impacts some usage patterns
+   * large - impacts most or all of angular apps
+1. Label "complexity: *"
+    * small - trivial change
+    * medium - non-trivial but straightforward change
+    * large - changes to many components in angular or any changes to $compile, ngRepeat or other "fun" components
+1. Label "PRs welcome" for "GH: issue"
+    * if complexity is small or medium and the problem as well as solution are well captured in the issue
+1. Label "cla: yes" for "GH: PR": 
+    * otherwise prompt the contributor to sign the CLA
+1. Label "origin: google" for issues from Google
+1. Label "high priority" for security issues, major performance regressions or memory leaks
+
+1. Unassign yourself from the issue
+