add: API server(#422)

Add an example of api server so that devs can quickly get up a bot running along with its api

examples/api_server/api_server.py

@@ -0,0 +1,42 @@
+from flask import Flask, jsonify, request
+
+from embedchain import App
+
+app = Flask(__name__)
+
+
+def initialize_chat_bot():
+    global chat_bot
+    chat_bot = App()
+
+
+@app.route("/add", methods=["POST"])
+def add():
+    data = request.get_json()
+    data_type = data.get("data_type")
+    url_or_text = data.get("url_or_text")
+    if data_type and url_or_text:
+        try:
+            chat_bot.add(data_type, url_or_text)
+            return jsonify({"data": f"Added {data_type}: {url_or_text}"}), 200
+        except Exception:
+            return jsonify({"error": f"Failed to add {data_type}: {url_or_text}"}), 500
+    return jsonify({"error": "Invalid request. Please provide 'data_type' and 'url_or_text' in JSON format."}), 400
+
+
+@app.route("/query", methods=["POST"])
+def query():
+    data = request.get_json()
+    question = data.get("question")
+    if question:
+        try:
+            response = chat_bot.chat(question)
+            return jsonify({"data": response}), 200
+        except Exception:
+            return jsonify({"error": "An error occurred. Please try again!"}), 500
+    return jsonify({"error": "Invalid request. Please provide 'question' in JSON format."}), 400
+
+
+if __name__ == "__main__":
+    initialize_chat_bot()
+    app.run(host="0.0.0.0", port=5000, debug=False)