Update README.md

added basic build guide.

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-# rive-tizen
+# Rive-Tizen
+## Build Rive-Tizen
+### Prepare Sub Modules
+Rive-Tizen extends [rive-cpp](https://github.com/rive-app/rive-cpp)  project for exchanging backend rendering engine to Tizen specific.
+Thus, you can immediately clone the rive-cpp project and build it on Rive-Tizen repo.
+```
+git submodule update --init --recursive
+```
+
+### Build Rive-Tizen
+Basically, Rive-Tizen supports [meson](https://mesonbuild.com/) build system.
+
+Install [meson](http://mesonbuild.com/Getting-meson.html) and [ninja](https://ninja-build.org/) if not installed yet.
+
+Run meson to configure Rive-Tizen.
+```
+meson build
+```
+Run ninja to build & install Rive-Tizen
+```
+ninja -C build install
+```