Add README.md

Documents some common failure modes

README.md

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+# Legacy IDRAC6 KVM invoker
+
+On modern systems, the iDRAC6 remote console client is broken. This software
+helps to restore usability on linux based systems.
+
+## Common errors
+
+
+Connection failed
+* This java applet needs to be in the list of trusted Java applications
+* The Java security level must be patched down. This software requires RC4 to be available as tls crypto algorithm (really!)
+
+
+Patch java.security
+```
+sed -i -e '/^jdk.tls.disabledAlgorithms=/s/, RC4//' /etc/java-*-openjdk/security/java.security
+```
+
+
+Exception in thread "main" java.awt.AWTError: Assistive Technology not found
+
+```
+sudo sed -i -e '/^assistive_technologies=/s/^/#/' /etc/java-*-openjdk/accessibility.properties
+```