Add More Examples

[vfrank66]

I used this orc reader for a project I was working and I wanted to offer an example I needed which helped me. I had nested orc structures I wanted to convert to json. If would like a PR I would be happy to submit to the README.md

// Example 2

   r, err := Open("./examples/demo-12-zlib.orc")
    if err != nil {
        log.Fatal(err)
    }
    defer r.Close()

    rootColumns := r.Schema().Columns()
    count := len(rootColumns)
    values := make([]interface{}, count)

    // Create a new Cursor reading the provided columns.
    c := r.Select(rootColumns...)


    returnData := make(map[string]interface{})
    // Iterate over each stripe in the file.
    for c.Stripes() {
        
        // Iterate over each row in the stripe.
        for c.Next() {
              
            // Retrieve a slice of interface values for the current row.
            log.Println(c.Row())
            
            currentRow := c.Row()
	    for i, _ := range values {
		masterData[rootColumns[i]] = currentRow[i]
	    }
			
	    slicer, _ := json.Marshal(returnData)
	    fmt.Println(string(slicer))
        }
       
    }

    if err := c.Err(); err != nil {
        log.Fatal(err)
    }

This is taken from https://github.com/vfrank66/aws-s3-orc-to-kinesis.