[IOTDB-277] Update README.md (#492)

* Update README.md Add an example csv file

README.md

@@ -65,6 +65,14 @@ For the latest information about IoTDB, please visit our [IoTDB official website
     - Stop IoTDB
  - Only build server
  - Only build client
+ - Usage of import-csv.sh
+    - Create metadata
+    - An Example of import csv file
+    - Run import shell
+    - Error data file
+ - Usage of export-csv.sh
+    - Run export shell
+    - Input query
 
 <!-- /TOC -->
 
@@ -302,3 +310,56 @@ Under the root path of incubator-iotdb:
 ```
 
 After build, the IoTDB client will be at the folder "client/target/iotdb-client-{project.version}".
+
+## Usage of import-csv.sh
+
+### Create metadata
+```
+SET STORAGE GROUP TO root.fit.d1;
+SET STORAGE GROUP TO root.fit.d2;
+SET STORAGE GROUP TO root.fit.p;
+CREATE TIMESERIES root.fit.d1.s1 WITH DATATYPE=INT32,ENCODING=RLE;
+CREATE TIMESERIES root.fit.d1.s2 WITH DATATYPE=TEXT,ENCODING=PLAIN;
+CREATE TIMESERIES root.fit.d2.s1 WITH DATATYPE=INT32,ENCODING=RLE;
+CREATE TIMESERIES root.fit.d2.s3 WITH DATATYPE=INT32,ENCODING=RLE;
+CREATE TIMESERIES root.fit.p.s1 WITH DATATYPE=INT32,ENCODING=RLE;
+```
+
+### An example of import csv file
+
+```
+Time,root.fit.d1.s1,root.fit.d1.s2,root.fit.d2.s1,root.fit.d2.s3,root.fit.p.s1
+1,100,'hello',200,300,400
+2,500,'world',600,700,800
+3,900,'IoTDB',1000,1100,1200
+```
+
+### Run import shell
+```
+# Unix/OS X
+> $IOTDB_CLI_HOME/tools/import-csv.sh -h <ip> -p <port> -u <username> -pw <password> -f <xxx.csv>
+
+# Windows
+> $IOTDB_CLI_HOME\tools\import-csv.bat -h <ip> -p <port> -u <username> -pw <password> -f <xxx.csv>
+```
+
+### Error data file
+
+`csvInsertError.error`
+
+## Usage of export-csv.sh
+
+### Run export shell
+```
+# Unix/OS X
+> $IOTDB_CLI_HOME/tools/export-csv.sh -h <ip> -p <port> -u <username> -pw <password> -td <directory> [-tf <time-format>]
+
+# Windows
+> $IOTDB_CLI_HOME\tools\export-csv.bat -h <ip> -p <port> -u <username> -pw <password> -td <directory> [-tf <time-format>]
+```
+
+### Input query
+
+```
+select * from root.fit.d1
+```
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