add http call demo

Signed-off-by: 明扬 <[email protected]>

http-client.env.json

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+{
+  "demo": {
+    "exampleServer": "mingyang91-polyhedron.hf.space"
+  }
+}

student.http

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+### student API
+// IN message: N/A
+// - id: [Required], course ID
+// - language: [Required], zh-CN, en-US
+// - voice: [Required], Takumi
+// *language & voice support matrix*: https://docs.aws.amazon.com/zh_cn/polly/latest/dg/voicelist.html
+// OUT message:
+// example1: {"type":"original","content":"哎，","isFinal":true}
+// example2: {"type":"translated","content":"ねえ、"}
+// example3: {"type":"lipSync","visemes":[{"time":12,"value":"t"},{"time":25,"value":"@"},{"time":200,"value":"sil"}]}
+// example4: Binary data, PCM audio, 16K sampling rate, single channel, 16-bit depth, little endian
+WEBSOCKET wss://{{$exampleServer}}}/ws/student?id=456&language=zh-CN&voice=Takumi

teacher.http

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+### teacher API
+// ONLY SUPPORT SINGLE TEACHER PER COURSE ID
+// IN message:
+// Binary data, PCM audio, 16K sampling rate, single channel, 16-bit depth, little endian
+// id: [Required], course ID
+// language: [Required], zh-CN, en-US... (see https://docs.aws.amazon.com/zh_cn/transcribe/latest/dg/supported-languages.html)
+// prompt: [Optional], All background and context about the course topic
+// OUT message:
+// example1: {"type":"original","content":"之后","isFinal":false}
+// example2: {"type":"original","content":"之后的资本就是说做的工作的做的东西","isFinal":true}
+WEBSOCKET wss://{{$exampleServer}}}/ws/teacher?id=456&language=zh-CN&prompt=