Merge pull request #1 from DavisHenckel/FAQ_Docs_2

Faq docs 2

FAQ/How to Create an Empty Excel File.md

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+# Create an Empty Excel File
+Use an empty string to export to an excel file.
+```powershell
+#Build an Excel file named: "file.xlsx" containing a worksheet: "MyWorksheet"
+"" | Export-Excel -Path "C:\Test\file.xlsx -WorksheetName "MyWorksheet" 
+```

FAQ/How to Write to an Existing Excel File.md

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+# Write to an Existing Excel File
+### Enumerate the Excel File
+```powershell
+$ExcelPkg = Open-ExcelPackage -Path  "C:\Test\file.xlsx"
+```
+Contents of file.xlsx:  
+![ExcelFileContents](/images/FAQ_Images/ExcelFileContents.png)
+### Enumerate the Worksheet to View or Modify the Data
+```powershell
+$WorkSheet = $ExcelPkg.Workbook.Worksheets["sheet1"].Cells #open excel worksheet cells from worksheet "sheet1"
+```
+Visual of data structure:  
+![DataStructureExcelPkg](/images/FAQ_Images/DataStructureExcelPkg.png)  
+A1 contains "someHeader", A2 contains "data1" etc.
+### Modify a Specific Value in a File 
+Values can be accessed by row, column. Similar to a 2D array.
+```powershell
+$WorkSheet[1,4].Value = "New Column Header" #Starts at index 1 not 0
+```
+Contents of file.xlsx after modifying:  
+![ExcelFileContentsPostAdd](/images/FAQ_Images/ExcelFileContentsPostAdd.png)  
+### Load Value at Specific Index
+```powershell
+$ValueAtIndex = $WorkSheet[2,1].Value #Loads the value at row 2, column A
+```
+```$ValueAtIndex``` now contains: ![ValueAtIndexData](/images/FAQ_Images/ValueAtIndexData.png)  
+### Save File After Modifying
+The changes will not display in the Excel file until Close-ExcelPackage is called.  
+```powershell
+Close-ExcelPackage $ExcelPkg #close and save changes made to the Excel file.
+```
+**Note**: If the file is currently in use, Close-ExcelPackage will return an error and will not save the information.
+