add main page for subfolder

Wireless-Communication/Protocol/README.md

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+<header><h1>
+Protocol de communication wireless
+</h1></header>
+
+- [Glossaire](/Wireless-Communication/Protocol/glossary)
+- [5G](/Wireless-Communication/Protocol/5g)
+- [C-V2X vs ITS-G5](/Wireless-Communication/Protocol/C-V2X-vs-ITS-G5)

Wireless-Communication/Train/README.md

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+<header><h1>
+Protocol de communication wireless
+</h1></header>
+
+- [Glossaire](/Wireless-Communication/Train/glossary)
+- [Channel model for performance evaluation](/Wireless-Communication/Train/Channel-model-for-performance-evaluation)
+- [FRMC - Projet 5GRail](/Wireless-Communication/Train/FRMC-Projet-5GRail)