Add README

Add README with build instruction.

Signed-off-by: Yasushi SHOJI <[email protected]>

Author: yashi

README.md

@@ -0,0 +1,16 @@
+# libcsp with FreeRTOS
+
+This repository is a sample repository to build libcsp against
+FreeRTOS Posix/Linux Simulator.
+
+# How to build
+
+```
+git clone https://github.com/libcsp/libcsp-freertos
+cd libcsp-freertos
+git clone https://github.com/FreeRTOS/FreeRTOS-Kernel freertos
+mkdir subprojects
+git clone https://github.com/libcsp/libcsp subprojects/libcsp
+meson setup builddir
+ninja -C builddir
+```