feat: add support for org and project official env vars (64bit#482)

* add support for org and project official env vars

* update readme

* typo

(cherry picked from commit 0760acc)

Author: 64bit

async-openai/README.md

@@ -78,6 +78,8 @@ export OPENAI_API_KEY='sk-...'
 $Env:OPENAI_API_KEY='sk-...'
 ```
 
+Other official environment variables supported are: `OPENAI_ADMIN_KEY`, `OPENAI_BASE_URL`, `OPENAI_ORG_ID`, `OPENAI_PROJECT_ID`
+
 - Visit [examples](https://github.com/64bit/async-openai/tree/main/examples) directory on how to use `async-openai`,
   and [WASM examples](https://github.com/ifsheldon/async-openai-wasm/tree/main/examples) in `async-openai-wasm`.
 - Visit [docs.rs/async-openai](https://docs.rs/async-openai) for docs.

async-openai/src/config.rs

@@ -78,8 +78,8 @@ impl Default for OpenAIConfig {
                 })
                 .unwrap_or_default()
                 .into(),
-            org_id: Default::default(),
-            project_id: Default::default(),
+            org_id: std::env::var("OPENAI_ORG_ID").unwrap_or_default(),
+            project_id: std::env::var("OPENAI_PROJECT_ID").unwrap_or_default(),
             custom_headers: HeaderMap::new(),
         }
     }