Add license and basic docs.

LICENSE.txt

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+Copyright (c) 2006-2010 Collecta, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.txt

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+Strophe.js is a JavaScript library for speaking XMPP in web
+applications. It supports extension via a plugin system.
+
+This is a collection of Strophe.js plugins created and maintained by
+the community.
+
+The homepage for Strophe.js is http://code.stanziq.com/strophe.
+The homepage for the Strophe.js community plugins collection is
+https://github.com/metajack/strophejs-plugins.
+
+If you would like to make your plugin available here, simply fork this
+repository, commit your plugin, and issue a pull request. The same
+instructions also work for any changes you wish to make to existing
+plugins.
+
+The book Professional XMPP Programming with JavaScript and jQuery is
+also available, which covers Strophe in detail in the context of web
+applications. You can find more information at
+http://professionalxmpp.com.  Two free chapters are available at
+http://professionalxmpp.com, including one specifically on writing
+Strophe.js plugins.