listen, he is proboboly fine. The water is cloudy because you just started something called the nitrogen cycle.
DO NOT put any "medicine/salt" into the tank right now you are probobly killing him. Try to get blood worms into a turkey baster and then squeeze them out of the baster right in front of him. I don't think you should be feeding him shrimp, I would stick to food designed specifically for ADF's and bloodworms.
You can add a few tankmates, like more ADF's, some shrimp, and many different types of fish. Feel free to ask if you have anymore questions.
ps. Good job so far by not skimping out on equipment for the tank, make sure that you keep up with maintence and you should be fine!
Do NOT listen to the advice about adding more tank mates right now. as the tank is still cycling, let the tank finish cycling. adding more creatures and bioload (aka poop and pee) to the tank will only cause the water chemistry to fluctuate more and can cause more harm to the frog. Second, feeding shrimp to the frog is fine, as long as you provide a variety of foods and not just shrimp alone, its fine.
Like Ash and others have said, they have poor eyesight, so feeding the frog with tweezers or eyedropper to put the food directly in front of him/her would make things easier for him/her to eat.
Your water is cloudy simply because your tank is still establishing itself. Keep doing water changes and making sure to dechlorinate the water.
Unfortunately, I can't say for sure the long term health of the frog without seeing a picture or having exact readings from your tank. As said before, dip strips are unreliable for exact reading. However, they can be useful for a quick check if you think the tank may be having issues.
I've had a few ADF's and I was able to keep 3 alive for a few years before they disappeared (I think another fish got big enough to eat them). The biggest thing to remember is that frogs do absorb a lot through their skin, so water changes are very important right now.