README has been extended with commands

Makefile

@@ -21,7 +21,7 @@ local-docker-build:
 	docker build -t $(TAG) .
 
 local-docker-run:
-	docker run --rm $(TAG)
+	docker run --rm -p 8081:80 $(TAG)
 
 # GCloud-specific targets
 TAG_GCLOUD = gcr.io/$(GCP_PROJECT_ID)/$(APP_LOWER_CASE):$(ENVIRONMENT)

README.md

@@ -1,8 +1,37 @@
 # SummingMicroservice
 A Go microservice that computes and returns the sum of two numbers.
 
-Before using GCloud-specific targets, export the following environment variables:
-- export ENVIRONMENT=staging
-- export GCP_PROJECT_ID=*\<YOUR GCP PROJECT ID\>*
+### **Commands of local use (dev version):**
+```
+make build
+make run
+curl "127.0.0.1:8081/sum?a=1&b=4"               # For testing
+google-chrome "127.0.0.1:8081/sum?a=1&b=4"      # For testing
+```
+
+### **Commands of local Docker use (dev version):**
+```
+make local-docker-build
+make local-docker-run
+curl "0.0.0.0:8081/sum?a=1&b=4"             # For testing
+google-chrome "0.0.0.0:8081/sum?a=1&b=4"    # For testing
+```
+
+### **Commands of GCloud use (staging version):**
+```
+export ENVIRONMENT=staging
+export GCP_PROJECT_ID=<YOUR GCP PROJECT ID>      # Replace the <YOUR GCP PROJECT ID> !!!
+make gcloud-docker-init                          # This only needs to be run once !
+make gcloud-docker-build
+make gcloud-docker-push                          # This pushes the docker image into the GCloud's Container Registry
+make gcloud-run-deploy                           # This deployes the pushed docker image into the GCloud's Cloud Run
+google-chrome "https://<LINK PROVIDED BY GCLOUD'S CLOUD RUN>/sum?a=1&b=4"   # For testing
+```
+
+### **Commands of GCloud use (production version):**
+```
+git push origin main    # This delivers the changes to GitHub main and the GitHub Actions builds, pushes and deployes it to GCloud.
+google-chrome "https://<LINK PROVIDED BY GCLOUD'S CLOUD RUN>/sum?a=1&b=4"   # For testing
+```
 
 Based on https://github.com/SanFranciscobolJottem/penguin-api