Add Windows path example for db creation

[Ed McDonagh]

Installation instructions describe 'NAME': '/ENTER/PATH/WHERE/DB/FILE/CAN/GO' which doesn't explicitly say the last bit should be a database file name rather than a folder. Modify, and add a Windows example.

[Ed McDonagh]

Added Windows and Linux database path examples. Fixes #7.

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[Ed McDonagh]

Removed the download link to make way for new get involved link with dropdown links. Added getinvolved folder and index page. Refs #7.

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[Ed McDonagh]

Added link to DICOM standard; added project to add mA/slice information; added some text to the Get involved page. Refs #7

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[Ed McDonagh]

Removed link to Website under get involved, added nav to other pages. Refs #7

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[Ed McDonagh]

Corrected title for Get involved. Added blurb to top of projects page. Refs #7

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[Ed McDonagh]

Merging the changes made for trying to make it easier for the community to get involved. Work in progress, but may as well be live! Refs #7

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[Ed McDonagh]

Added twitter feed project. Refs #7.

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[Ed McDonagh]

Added a task to add tasks or vote for them. Refs #7.

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