Add link to manual installation steps. Closes #577.

Updated, per recommendation in #566.

For some reason Github Flavored Markdown can't handle back slashes and angle brackets.

BAD: `Users\<user>\AppData` becomes `Users<user\AppData`
BAD: `Users\\<user>\AppData` becomes `Users\\AppData`
BAD: `Users\&lt;user&gt;\AppData` becomes `Users&lt;user>\AppData`
OK:   `Users\\&lt;user&gt;\AppData` becomes `Users\<user>\AppData`

Closes #492.

Sorry to be picky, but I got bitten by some ambiguous date format problems recently so...

The date I am converting (9/6/19) is Sep 6th if it is in US format and is June 9th for all other English speaking countries (I'm highlighting English countries only because this text is in English).  I determined that it is US format by looking at the date of the commit.

I suggest that stuff like this use [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) format because it is unambiguous, it is popular amongst developers, it is getting wider adoption, and it is a great format!  Thanks.

Just adding some headings etc

Added note about code-signed executable.

Added attribution for @s-h-a-d-o-w.

Typo corrected

Fixed line breaks in README usage examples.

Adds a badge showing the number of people helping this repo on CodeTriage.

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Fixes #245.

- Added badges for issue count and repo stars
- Updated screenshots