Add example policy file and update README

README

@@ -1,6 +1,6 @@
 Clojurebot v2
 
-Version 2 of clojurebot is not yet very thoroughly tested; the sandbox is not restricted by default, and some knowledge of java security manager is needed to install an appropriate policy file. 
+Version 2 of clojurebot is not yet very thoroughly tested; the sandbox is not restricted by default, and some knowledge of java security manager is needed to install an appropriate policy file. See the example.policy file to get an idea how to accomplish this.
 
 This version should have feature parity with v1 now.
 

example.policy

@@ -0,0 +1,19 @@
+/* Grant all for the REPL; the sandbox created will "throw away" these permissions, 
+ * but they are still needed for clojurebot to start up properly.
+
+   You will need to start the java virtual machine with the following extra args:
+
+     -Djava.security.manager -Djava.security.policy="file:///path/to/this.policy"
+
+   With this grant-all setup, clojurebot can also be run from SLIME.
+*/
+
+grant {
+  permission java.security.AllPermission;
+};
+
+/* Untested, more specific grant. Would not work with SLIME or a repl.
+grant codeBase "file:///Users/oranenj/koodi/VCS/clojurebot/" {
+  permission java.security.AllPermission;
+};
+*/