Add markdown for Infra troopers

site/dev/sheriffing/trooper.md

Index: site/dev/sheriffing/trooper.md
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+Infra Trooper Documentation
+===========================
+
+### Contents ###
+
+*   [What does an Infra trooper do?](#what_is_a_trooper)
+*   [View current and upcoming troopers](#view_current_upcoming_troopers)
+*   [How to swap trooper shifts](#how_to_swap)
+*   [Tips for troopers](#tips)
+
+
+<a name="what_is_a_trooper"></a>
+What does an Infra trooper do?
+------------------------------
+
+The trooper has two main jobs:
+
+1) Keep an eye on Infra alerts emails (sent to infra-alerts@skia.org). The alerts are also available [here](https://alerts.skia.org/infra).
+
+2) Resolve the above alerts as they come in.
+
+<a name="view_current_upcoming_troopers"></a>
+View current and upcoming troopers
+----------------------------------
+
+The list of troopers is specified in the [skia-tree-status web app](http://skia-tree-status.appspot.com/trooper). The current trooper is highlighted in green.
+The banner on the top of the [status page](https://status.skia.org) also displays the current trooper.
+
+
+<a name="how_to_swap"></a>
+How to swap trooper shifts
+--------------------------
+
+If you need to swap shifts with someone (because you are out sick or on vacation), please get approval from the person you want to swap with. Then send an email to skiabot@google.com and cc rmistry@.
+
+
+<a name="tips"></a>
+Tips for troopers
+-----------------
+Add your tips here!