Update README.md

Author: Atsushi Abe

README.md

@@ -1,2 +1,21 @@
-# CentOS-Build
-LTFS build environemt on CentOS
+# LTFS Build docker action for CentOS7
+
+This action builds the LTFS package on CentOS7
+
+## Inputs
+
+### `destination`
+
+**required** Destination of install。 Default is `/tmp/ltfs`。
+
+## Output
+
+None
+
+## Usage
+
+```
+uses: LinearTapeFileSystem/CentOS7-Build@v1.0
+with:
+  destination: '/tmp/ltfs'
+```