added race condition usage of Burp

Exploits/Web/Race Conditions.md

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+# Race Conditions
+
+Race conditions inside web applications can be tested through flooding a server with HTTP requests.
+
+You can use Burpsuite for this or create a script.
+
+## Create a Race Condition through Burpsuite
+
+Send the intercepted request to the Repeater. Create a tab group an insert said
+request. duplicate the request multiple times through right clicking the tab of
+the request. Click on the "V" right next to the Send button. Send the request
+through "Send group in parallel (last byte-sync)", additionally try "Send group
+in sequence (seperate connections)".
+
+