Adding README file for the Installer testing

diff --git a/tests/selenium/installer/README.txt b/tests/selenium/installer/README.txt
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+== Details==
+
+Automated Selenium test scripts written for MediaWiki Installer is available at svn.wikimedia.org/svnroot/mediawiki/trunk/phase3/tests/selenium/installer.
+Detailed test cases available at http://www.mediawiki.org/wiki/New_installer/Test_plan.
+
+Version : MediaWiki 1.18alpha
+Date   : 27/12/2010
+
+== Running tests ==
+
+Test cases can be run independently or can run all the test cases using MediaWikiInstallerTestSuite.php within PHPUnit/Selenium.
+
+
+== Dependencies == 
+
+MediaWikiInstallationConfig.php
+
+Value of the 'DB_NAME_PREFIX' should be replace with the database name prefix. Several DB instances will get created to cover different installation scenarios starting with the above prefix.
+You need to change the value of the 'DB_NAME_PREFIX' in MediaWikiInstallationConfig everytime you planned to
+run the tests.
+'DIRECTORY_NAME', 'PORT' and the 'HOST_NAME' should be replaced with your local values.
+You may specify the test browser you wish to run the test using 'TEST_BROWSER'.  Default browser is Firefox.
+
+Note : MediaWikiInstallerTestSuite.php has no dependency on 'Selenium' test framework.
+
+
+== Known problems ==
+
+If you run the MediaWikiInstallerTestSuite.php twice without changing the name of the database, the second run should be falied.
+(Please read the more information on how to change the database name which is avaialable under 'Dependencies' section)
+
+