Add guide-main.md

Author: SilentSegfault

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

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+## Instructions
+* [Rationale](docs/project_rationale_01.md)
+* [Automated setup with **newSPACKDevArea.sh**](docs/initial_setup_02.md)
+* [Configuration guide for **newSPACKDevArea.sh**](docs/configuration_file_03.md)
+* [Spack project directory structure](docs/directory_structure_04.md)
+* [Activate, aka `setup`, project area](docs/setup_project_05.md)
+* [Spack mirrors and build caches](docs/spack_mirrors_08.md)
+
+## Examples
+* [config.yaml](examples/example_config_yaml.md)
+* [repos.yaml](examples/example_repos_yaml.md)
+
+## Logs
+* [Log file generated by **newSPACKDevArea.sh**](logs/newSPACKDevArea-log.md)