Improve Quick Start instructions

[erickb]

• Add note that it is best to check "Add Julia to PATH" when installing Julia
• Expand upon "open Julia in that folder", providing multiple options
• Add privacy statement and report .zip download is safe to MS

[erickb]

From a user: "I have tried to start running AMES following the Quick Start instruction.
Unfortunately, I did not understand the fourth step, "4. Start Julia in that folder and run the demo model."
I would like to have more explanation from you"

[erickb]

Sample instructions:

1. Start Julia (for example, by clicking on the Desktop icon).
2. Change the directory to where you have unzipped the sample files using Julia’s “cd()” (change directory) function. For example:

julia> cd(raw"C:\PATH TO FOLDER\AMES")

Note that I used a “raw” string, raw"…". If you don’t do that, then Julia has trouble with the backslashes.

3. Now you are in that folder. You can check by using Julia’s function “pwd()” (print working directory) function.

Now you have opened Julia in the folder where you unzipped the files and you can follow the instructions.

Here is another way:

1. Open a Windows command prompt.
2. Use Windows’ cd command: C:\> cd C:\PATH TO FOLDER\AMES
3. Start Julia: C:\> julia