Update page 'Visual'

Visual.md

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+![Visual Help Image](https://raw.githubusercontent.com/CS-4820-Library-Project/Libly/master/images/VisualHelp.png)
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+The Visual page allows you to create charts or graphs using the information stored in the database. 
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+This provides an alternate method of retrieving information from the Search page. While retaining accuracy. 
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+By selecting a report type the page will modify to ask you for the appropriate data. 
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+When selecting a year, make sure that the data you are looking for has already been added into the database either by fetching the reports or importing them. 
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+You can select the type of chart you want from Chart Type followed by Calculation Type. Calculation Type is how you want to display the data along the main axis. 
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+You can customize your chart by entering Chart Title, Horizontal Axis Title and Vertical Axis Title.
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+Select the Vendor you are interested in, and the corresponding data to retrieve. Finally select the Metric_Type corresponding to the metric you want to chart.
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