Create README.md

Author: snowwolf725

README.md

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+# payload repack tool
+
+Using delta_generator to repack `payload.bin`.
+
+## Installation
+
+### Requirements
+
+- openssl
+- openssl-tool
+
+```bash
+pkg install openssl-tool
+```
+
+## Usage
+
+### repack `payload.bin`
+
+```bash
+git clone https://github.com/snowwolf725/Payload_Repack_Tool.git
+cd Payload_Repack_Tool
+#copy *.img into images folder
+#cp -a *.img images
+./repack.sh
+```