add README, solves #1

README.md

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+# A mini ticket system (full-stack application)
+
+It includes:
+
+0. A webserver written in Go
+
+as well as two clients:
+
+1. A CLI for Linux written in C++,
+2. An Android app written in Kotlin.
+
+Both clients can:
+
++ Create a ticket,
++ List all tickets (with an option to filter by status),
++ Get a detailed view of a specific ticket.