Introduce examples dir with an autoinstrumented flask app

Author: xrmx

examples/flask/Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+COPY . /app
+
+RUN pip install flask elastic-opentelemetry
+
+# Install all the available instrumentations
+RUN opentelemetry-bootstrap -a install
+
+# default flask run port
+EXPOSE 5000
+
+# Set some resource attributes to make our service recognizable
+ENV OTEL_RESOURCE_ATTRIBUTES="service.name=FlaskService,service.version=0.0.1,deployment.environment=development"
+
+CMD ["opentelemetry-instrument", "flask", "run"]

examples/flask/README.md

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+# Flask autoinstrumented application
+
+This is a barebone Flask app used for demonstrating autoinstrumentation with EDOT.
+
+You can build the application image it with:
+
+```
+docker build --load -t edot-flask:latest .
+```
+
+You can run the application with:
+
+```
+export OTEL_EXPORTER_OTLP_ENDPOINT=https://my-deployment.apm.us-west1.gcp.cloud.es.io
+export OTEL_EXPORTER_OTLP_HEADERS="Authorization=Bearer P....l"
+docker run -e OTEL_EXPORTER_OTLP_ENDPOINT="$OTEL_EXPORTER_OTLP_ENDPOINT" \
+  -e OTEL_EXPORTER_OTLP_HEADERS="$OTEL_EXPORTER_OTLP_HEADERS" \
+  -p 5000:5000 -it --rm edot-flask:latest
+```
+
+You can access the application from [http://127.0.0.1:5000](http://127.0.0.1:5000).

examples/flask/app.py

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+from flask import Flask, jsonify
+
+app = Flask(__name__)
+
+
+@app.route("/", methods=["GET"])
+def home():
+    return jsonify(message="Hello, world!")