Add Useful Links

Author: SilentSegfault

sbn_online_wiki/develop-sbndaq-with-spack/guide-main.md

@@ -12,3 +12,14 @@
 
 ## Logs
 * [Log file generated by **newSPACKDevArea.sh**](logs/newSPACKDevArea-log.md)
+
+## Sources
+  [sbndaq-spack-tools](https://github.com/SBNSoftware/spack-top/tree/main/sbndaq-spack-tools)
+  [newSPACKProjArea.env](https://github.com/SBNSoftware/spack-top/blob/main/sbndaq-spack-tools/newSPACKProjArea.env)
+  [Main README.md](https://github.com/SBNSoftware/spack-top/blob/main/sbndaq-spack-tools/README.md)
+  [Modules README.md](https://github.com/SBNSoftware/spack-top/blob/main/sbndaq-spack-tools/modules/README.md)
+
+## Usefull links
+  [Spack documentstion](https://spack.readthedocs.io/en/latest/)
+  [MPD documentation](https://github.com/FNALssi/spack-mpd)
+  [`env` file format](https://github.com/env-lang/env/blob/main/env.md)