Quickstarts for conversation API

[msfussell]

Give the new conversational API in v1.15 we need samples for the support languages and SDKs.

• Go Conversation API quickstart #1102
• DotNet Conversation API quickstart #1103
• Java Conversation API quickstart #1155
• JS Conversation API quickstart #1156
• Python Conversation API quickstart #1157
• HTTP Java Conversation API quickstart #1104
• HTTP DotNet Conversation API quickstart #1105
• HTTP Go Conversation API quickstart #1106
• HTTP JS Conversation API quickstart #1107
• HTTP Python Conversation API quickstart #1108

[alicejgibbons]

Priority: Go and dotnet SDKs, http for python/java.

[alicejgibbons]

Moving to 1.16 since Python, JS and Java don't have SDK implementations