Agregué el README

Un archivo markdown con la info básica del proyecto (para github)

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+#Grita
+
+Grita es un app sencillo hecho con Sinatra que almacena texto en formato markdown y genera urls y códigos QR-Code para poder compartirlo. Está diseñado para ejecutarse en heroku.
+
+Para generar las tablas necesarias con DataMappeer, se debe correr irb desde el directorio raiz de la aplicación y correr los siguientes comandos:
+
+       >> require 'grita.rb'
+       >> DataMapper.auto_migrate!
+
+(NOTA: Con Heroku no es necesario importar el archivo grita.rb y solo se corre el último comando)
+
+Para instalar las dependencias se debe correr el siguiente comando:
+
+       $ bundle install
+
+Para correr la aplicación simplemente se debe de correr el siguiente comando:
+
+       $ ruby -rubygems grita.rb
+
+#Licencia
+
+Este trabajo está distribuído bajo la nueva licencia BSD que se muestra a continuación:
+
+       Copyright (c) 2010, Rubén Beltrán del Río
+       All rights reserved.
+
+       Redistribution and use in source and binary forms, with or without
+       modification, are permitted provided that the following conditions are met:
+       * Redistributions of source code must retain the above copyright
+         notice, this list of conditions and the following disclaimer.
+       * Redistributions in binary form must reproduce the above copyright
+         notice, this list of conditions and the following disclaimer in the
+         documentation and/or other materials provided with the distribution.
+       * Neither the name of the organization nor the
+         names of its contributors may be used to endorse or promote products
+         derived from this software without specific prior written permission.
+
+       THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+       ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+       WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+       DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+       DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+       (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+       LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+       ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+       (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+       SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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