initial ui for chat with pdf

[PrinceBaghel258025]

• replaced Generating id text with Starting Chat
• introduced langsmith tracer for title generation
• initial ui flow for chat with pdf

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Name	Status	Preview	Comments	Updated (UTC)
echoes	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 26, 2023 5:01am

[PrinceBaghel258025]

• closes #19

[sutyum]

LANGCHAIN_API_KEY? Did you mean to add LANGSMITH_API_KEY?

[sutyum]

try replacing the background color of the app with: linear-gradient(90deg, #000 8px, transparent 1%) 50%, linear-gradient(#000 8px, transparent 1%) 50%, #1e1e1e

[PrinceBaghel258025]

LANGCHAIN_API_KEY? Did you mean to add LANGSMITH_API_KEY?

we have to put langsmith api key but the name of the secret should be LANGCHAIN_API_KEY

[sutyum]

Fix the lint error

[PrinceBaghel258025]

• closes #16