Add readme and build scripts

python-microservices-with-grpc/README.md

+# Running the Example
+
+1. Install Docker if you haven't already.
+2. Run `./build_and_run.sh`

python-microservices-with-grpc/build_and_run.sh

+#!/bin/bash
+
+./gen_certs.sh
+
+DOCKER_BUILDKIT=1 docker build . -f marketplace/Dockerfile -t marketplace --secret id=ca.key,src=ca.key
+DOCKER_BUILDKIT=1 docker build . -f recommendations/Dockerfile -t recommendations --secret id=ca.key,src=ca.key
+
+docker-compose up

python-microservices-with-grpc/gen_certs.sh

+#!/bin/bash
+
+# Generate CA key and self-signed cert
+openssl req -x509 -nodes -newkey rsa:4096 -keyout ca.key -out ca.pem -subj /O=me
+
+# Generate a private key and certificate signing request for the client and server
+openssl req -nodes -newkey rsa:4096 -keyout client.key -out client.csr -subj /CN=marketplace
+openssl req -nodes -newkey rsa:4096 -keyout server.key -out server.csr -subj /CN=recommendations
+
+# Sign the client and server certs with the CA cert
+openssl x509 -req -in client.csr -CA ca.pem -CAkey ca.key -set_serial 1 -out client.pem
+openssl x509 -req -in server.csr -CA ca.pem -CAkey ca.key -set_serial 1 -out server.pem