Why the website says "Warning: Trade with extreme caution!" He is the developer of the coin but it shows red alert does it mean the coin is not safe to invest?
I am not the developer of LEOcoin, but the community manager from the LEOcoin Foundation. We do not trade in coins, so the warning is futile. It is given by a person that has a grudge against LEOcoin and abuses her power to give such warnings, as self-acclaimed crypto-cop. The read alert, that you mention, is due to policy, but not based on proven facts. I carry it with pride, because on every ahead move we make, it shows how wrong, fundamentalist and biased this person is.
As LEOcoin Foundation, we give no advice on investments, but encourage you to do your own DD. This said, LEOcoin is on the market for three years now. We are a legitimate digital currency with our own blockchain and a loyal supporting community. We prefer not to be a hyped coin, but try to offer a stable price and to offer a good stake reward and decent technological features, like anonymous chat and stealth payments. For issues like Github source code, Market Cap, Exchanges with LEOcoin trading pairs, please see our first post or have a look at CoinMarketCap, that also mentions some sources.