doc: Upadte docs

Author: Moe-hacker

README.md

@@ -35,6 +35,8 @@ See [TERMS_OF_USE.md](TERMS_OF_USE.md)
 # Full usage doc:
 For a full usage documentation,    
 See [USAGE.md](doc/USAGE.md).     
+# FAQ:
+See [FAQ.md](doc/FAQ.md).
 # Send us your feedback!
 Your use case, your suggestions, anyway, we would love to hear from you!     
 [Discussions](https://github.com/RuriOSS/rurima/discussions/16)      

blob/NOTE.md

@@ -0,0 +1,20 @@
+# nosuid for su/sudo:
+If su/sudo cannot work, especially in termux, please try remounting the filesystem without suid:     
+```sh
+mount -o remount,nosuid /data
+```
+# Network issues:
+## First, check dns setting:
+```sh
+cat /etc/resolv.conf
+```
+If there is no valid nameserver, please add one, for example:      
+```sh
+rm -f /etc/resolv.conf
+echo "nameserver 1.1.1.1" >> /etc/resolv.conf
+```
+## If still having network issues:
+Try running [fixup.sh](../blob/fixup.sh) in container.
+Or see [#13](https://github.com/RuriOSS/rurima/issues/13#issuecomment-3411117953)
+# Network isolation:
+Rurima does not provide network isolation support, a possible implementation is at [net_wrapper.sh](../blob/net_wrapper.sh)