Add example of .env file

[pacexy]

This will make it easier for users to set up environment variables.

[lingchuL]

目前代码里是按是否有相应配置来决定要使用OpenAI还是Azure的，并且在检测到有OpenAI的配置会直接使用OpenAI的API尝试，所以如果只是添加用例可能把几行都默认为注释状态比较好~
In the createLanguageModel process, which endpoint to use is determined by whether there is a corresponding configuration to them. It will try to get OpenAI env variable first, once it get the OPENAI_API_KEY, it will use OpenAI as endpoint. Therefore, it may be better to comment all those lines as the default state~

[pacexy]

目前代码里是按是否有相应配置来决定要使用OpenAI还是Azure的，并且在检测到有OpenAI的配置会直接使用OpenAI的API尝试，所以如果只是添加用例可能把几行都默认为注释状态比较好~ In the createLanguageModel process, which endpoint to use is determined by whether there is a corresponding configuration to them. It will try to get OpenAI env variable first, once it get the OPENAI_API_KEY, it will use OpenAI as endpoint. Therefore, it may be better to comment all those lines as the default state~

Maybe we can just keep it empty? (e.g. OPENAI_API_KEY=), and then it will not affect the createLanguageModel.

[lingchuL]

Yeah, it works too.

[Stevenic]

You don't normally include the "" quotes in .env.example files. empty is better

[pacexy]

You don't normally include the "" quotes in .env.example files. empty is better

Updated.

[Copilot]

Pull request overview

This PR adds a repository-root .env.example file so contributors can copy a ready-made template when configuring TypeChat examples that use OpenAI or Azure OpenAI credentials.

Changes:

• Add a new .env.example template at the repo root.
• Include example variables for OpenAI and Azure OpenAI setup.
• Mirror the environment variable guidance already documented in the examples docs/READMEs.

Show a summary per file

File	Description
.env.example	Adds a sample .env template intended to simplify local example configuration.

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