Add PeerFinder README doc

src/ripple/peerfinder/README.md

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+# PeerFinder
+
+The PeerFinder module has these responsibilities:
+
+- Maintain a set of addresses suitable for bootstrapping into the overlay.
+- Send and receive protocol messages for peer address discovery.
+- Provide network addresses to other peers that need them.
+- Maintain connections to the configured set of fixed peers.
+- Track and manage peer connection slots.
+
+## Description
+
+## Terms
+
+<table>
+<tr>
+  <td>Bootstrap</td>
+  <td>The process by which a Ripple peer obtains the initial set of
+      connections into the Ripple payment network overlay.
+  </td></tr>
+</tr>
+<tr>
+  <td>Overlay</td>
+  <td>The connected graph of Ripple peers, overlaid on the public Internet.
+  </td>
+</tr>
+<tr>
+  <td>Peer</td>
+  <td>A network server running the **rippled** daemon.
+  </td>
+</tr>
+</table>