Add README consisting build steps

Change-Id: Ia32507b45de297fea6fed40065c0791c5e0380c9
Signed-off-by: Nishant Chaprana <n.chaprana@samsung.com>

diff --git a/README.md b/README.md
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+# noise-suppression
+This library is used to suppress background noise from input PCM data.
+
+Build steps for Linux
+```
+mkdir ./out
+cd ./out/
+cmake ../ -DVERSION=1.1 -DCMAKE_INSTALL_PREFIX=/usr/local/ -DLIB_INSTALL_DIR=/usr/local/lib
+make
+```
+
+Build steps for Tizen
+```
+gbs -c ./.gbs.conf build -A armv7l --include-all
+```