Created Troubleshooting (markdown)

Troubleshooting.md

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+## Check logs
+
+Wlx-S will often show troubleshooting tips in the logs, so it's good to always check them first.
+
+By default, Wlx-S logs into `/tmp/wlx.log`.
+
+You may also change where to log to, there are 2 methods:
+- Pass the argument `--log-to=/path/to/wlx.log`
+- Set the env var `WLX_LOGFILE=/path/to/wlx.log`
+
+Argument takes precedence over env var.
+
+Setting either to `""` will disable logging to file.
+
+## Troubleshooting segmentation faults (SIGSEGV)
+
+Run Wlx-S in `rust-gdb` (or even regular `gdb`) to get more info about the segfault.
+
+Attach this with the other logs that you have.
+
+```
+rust-gdb -ex run target/debug/wlx-overlay-s
+```