Merge pull request #25 from androidx/gcpinstructions

Add instructions on how to set up GCP

Author: liutikas

README.md

@@ -53,3 +53,28 @@ buildCache {
     }
 }
 ```
+
+## Setting up Google Cloud Platform project
+
+1. [Install `gcloud` CLI on your machine](https://cloud.google.com/sdk/docs/install)
+2. Create a GCP project `YOUR-GCP-PROJECT` and [set up billing](https://cloud.google.com/billing/docs/how-to/manage-billing-account#create_a_new_billing_account).
+3. Create a Google Cloud Storage bucket
+```bash
+gsutil mb –p YOUR-GCP-PROJECT gs://YOUR-BUCKET-NAME
+```
+4. Create IAM roles for read and read/write
+```bash
+gcloud iam roles create CacheReadWrite --project=YOUR-GCP-PROJECT --title=CacheReadWrite --description="Have access to read and write to remote Gradle cache" --permissions=storage.buckets.get,storage.objects.create,storage.objects.delete,storage.objects.get,storage.objects.getIamPolicy,storage.objects.list
+gcloud iam roles create CacheRead --project=YOUR-GCP-PROJECT --title=CacheRead --description="Have access to read from remote Gradle cache" --permissions=storage.buckets.get,storage.objects.get,storage.objects.getIamPolicy,storage.objects.list
+```
+5. Create IAM Service Accounts
+```bash
+gcloud iam service-accounts create cache-read-write  --project=YOUR-GCP-PROJECT
+gcloud iam service-accounts create cache-read  --project=YOUR-GCP-PROJECT
+```
+6. Grant the service account roles that we just created
+```bash
+gcloud projects add-iam-policy-binding YOUR-GCP-PROJECT --member=serviceAccount:[email protected] --role=projects/YOUR-GCP-PROJECT/roles/CacheRead
+gcloud projects add-iam-policy-binding YOUR-GCP-PROJECT --member=serviceAccount:[email protected] --role=projects/YOUR-GCP-PROJECT/roles/CacheReadWrite
+```
+7. Use `YOUR-GCP-PROJECT` and `YOUR-BUCKET-NAME` in the plugin configuration with exported service account credentials.