At first you need to download spark library from apache spark website. The website is
http://spark.apache.org/downloads.html

After download, you will see the spark file like this.
To unzip the file, you need to have 7-zip exe. You can dowload it from
http://www.7-zip.org/download.html
By using 7-zip you can easily unzip the files. After unzip, you need to go to command prompt. Go to the spark folder like this

picture of spark folder command prompt.
Then you need to write the command
bin\spark-shell
The output will be like that

scala based prompt will be come up. You can read the readme.md using the programming. You need to write the following command.
val textFile = sc.textFile("README.md")
To count the text file line number, you need to write the command
textFile.count()
It will show the output which is 95.
To exit from scala library, you need to type the command
exit()
Then it will be in the command prompt.