jhsdb: add page (#6643)

pages/common/jhsdb.md

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+# jhsdb
+
+> Attach to a Java process or launch a postmortem debugger to analyze the core dump from a crashed Java Virtual Machine.
+> More information: <https://manned.org/jhsdb>.
+
+- Print stack and locks information of a Java process:
+
+`jhsdb jstack --pid {{pid}}`
+
+- Open a core dump in interactive debug mode:
+
+`jhsdb clhsdb --core {{path/to/core_dump}} --exe {{path/to/jdk/bin/java}}`
+
+- Start a remote debug server:
+
+`jhsdb debugd --pid {{pid}} --serverid {{optional_unique_id}}`
+
+- Connect to a process in interactive debug mode:
+
+`jhsdb clhsdb --pid {{pid}}`