Updated the readme for excel to json

examples/excel2json/README.md

@@ -0,0 +1,29 @@
+# Excel 2 Json
+- Read file excel to json
+- Custom mapping with custom columns
+
+# Build
+```shell
+bash build
+```
+OR
+```shell
+make build run
+```
+
+# Example
+```shell
+docker run -v /my/path:/app/data --rm -it cubetiq/node-excel2json
+```
+
+```shell
+docker run -v /home/sombochea/excel2json:/app/data -e APP_NAME="EXCEL 2 JSON" -e MAPPER_FILE="./data/mapper.json" --rm -it cubetiq/node-excel2json
+```
+
+# Environment
+```env
+APP_NAME=custom app name
+INPUT_FILE=./data/mydata.json
+OUTPUT_PATH=./data/outputs
+MAPPER_FILE=./data/mapper.json
+```