Add an installation procedure for the Pact Stub Server #260
Description
Add a complete installation procedure of the Standalone Pact Stub Server in the /tools/README.md file.
According to issue #242, it is done on the feature/inventory-change-4-0-0 branch
The feature/inventory-change-4-0-0 branch will not be merged to develop branch, see issue #247
Supporting files to be changed on a hotfix branch.
Copy the installation procedure of the Standalone Pact Stub Server from the /tools/README.md file on the feature/inventory-change-4-0-0 branch.