Add troubleshooting guide

TROUBLESHOOT.md

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+# Before we start the troubleshooting
+
+1. Please flash the debug version of the latest CI build in [GitHub Actions](https://github.com/JingMatrix/LSPosed/actions), which could have fixed the problem for you. Moreover, debug logs are necessary for maintainers to provide their helps. However, make sure that you pick up builds from the `master` branch instead of some working-in-progress pull-requests.
+2. For non-Magisk users, please flash the latest Zygisk module (debug version if possible), such as [ReZygisk](https://github.com/PerformanC/ReZygisk) or [ZygiskNext](https://github.com/Dr-TSNG/ZygiskNext/releases). The author [JingMatrix](https://github.com/JingMatrix) also contributes to ReZygisk.
+
+#  Status notification for LSPosed manger is not shown
+
+Update your root manager and use the `Action` button to open LSPosed manger
+
+# LSPosed manger cannot be opened
+
+1. Grant root permission to the system `Shell`(com.android.shell) application.
+2. Install LSPosed manger as a user application using the following command:
+```
+adb shell su -c cp /data/adb/modules/zygisk_lsposed/manager.apk /data/local/tmp && adb pull /data/local/tmp/manager.apk && adb install ./manager.apk
+```
+3. Open manager as a normal application from your launcher.
+
+# How to provide useful logs before asking helps?
+
+1. Please go through the previous instructions to open LSPosed manager successfully, and upload the generated logs in your issue.
+2. LSPosed manager will automatically save logs of the previous user session. Taking good advantage of the feature can help maintainers to find out a specific bug introduced in some single commit.
+3. In case that the LSPosed manager still cannot be opened, we need to the following logs (file `lsposed.log`) from `adb logcat`:
+```
+adb logcat -s Magisk lspd nativeloader AndroidRuntime LSPosed  LSPosed-Bridge LSPlant LSPosedContext zygisk64 LSPlt Dobby LSPosedService '*:F' > lsposed.log
+```
+4. The above `adb logcat` command is meant to capture the booting logs of LSPosed. Hence, one should connect the device with computer, authorize the `adb` connection, run `adb reboot`, and finally run the previous `adb logcat` command once the phone screen turns on.
+