feat(RHTAPWATCH-782): Add product version controller ADR (#166)

* Add product version controller ADR

Signed-off-by: Barak Korren <bkorren@redhat.com>

* PVC ADR: Typo fixes, Drop abbreviations and more examples

Signed-off-by: Barak Korren <bkorren@redhat.com>

* PVC ADR: Fixes for Andrew's comments

Signed-off-by: Barak Korren <bkorren@redhat.com>

* PVC ADR: Consequences section& Typo fixes

Signed-off-by: Barak Korren <bkorren@redhat.com>

* PVC ADR: Fixed template syntax & small typo

Also renamed the file to better reflect the controller name.

Signed-off-by: Barak Korren <bkorren@redhat.com>

* PVC ADR: Renumber the ADR.

Signed-off-by: Barak Korren <bkorren@redhat.com>

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Signed-off-by: Barak Korren <bkorren@redhat.com>