tls: Add draft README

Author: razvand

tls/README.md

@@ -0,0 +1,11 @@
+# Thread-Local Storage
+
+This is a tutorial / presentation on thread-local storage (TLS).
+TLS is a per-thread memory area used to store thread-specific data.
+Global data that are required to be specific per thread are usually stored as part of the TLS.
+
+https://docs.oracle.com/cd/E19120-01/open.solaris/819-0690/chapter8-1/index.html
+
+https://chao-tic.github.io/blog/2018/12/25/tls
+
+https://wiki.osdev.org/Thread_Local_Storage