doc: Add the applicable solution for resolving macOS issues (#124)

FAQ.md

@@ -2,12 +2,18 @@
 
 ## Encountering System Security Policy on First Run of Katharsis on macOS
 
+### Plan 1
+
 When you first run Katharsis on macOS, you might see a system security warning that looks like this:
 
-![Not_Opened](assets/faq/not_opened.png)
+![Not Opened](assets/faq/not_opened.png)
 
 This happens because the Katharsis binary was not signed with an Apple Developer Certificate during its build process in the [Actions](https://github.com/kurosakishigure/katharsis/actions/workflows/cd.yml). To resolve this issue, you can use the following steps:
 
-![Allow_Anyway](assets/faq/allow_anyway.png)
+![Allow Anyway](assets/faq/allow_anyway.png)
+
+### Plan 2
+
+If you prefer, you can also choose to install from source. For detailed instructions, please refer to [INSTALL.md](INSTALL.md).
 
-In the future, we plan to address this problem by enabling installation of Katharsis through package managers like [brew](https://brew.sh). If you're interested in helping us implement this feature, you can contribute by following the guidelines in [CONTRIBUTING.md](CONTRIBUTING.md).
+> In the future, we plan to address this problem by enabling installation of Katharsis through package managers like [brew](https://brew.sh). If you're interested in helping us implement this feature, you can contribute by following the guidelines in [CONTRIBUTING.md](CONTRIBUTING.md).