Setup Repository (Issue #1) (Closes #2)

* Creation of .gitignore file

* Addition of motivation, conventions, technology and frameworks to README.md

.gitignore

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+.DS_Store
+.idea

README.md

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-# mdd
+# Model-driven Software Engineering
+This test case generator produces test cases from plantUML diagrams.
+
+# Motivation
+The implementation of user requirements often deviates from the specification of the same user requirements. 
+Individual work, teamwork, and collaboration between teams can produce such a divergence. 
+For example, requirements may be misinterpreted or overlooked. 
+Teamwork, especially with multiple teams, causes interface errors. 
+For example, subsystems of the same product may use conflicting technologies or conflicting data formats.
+
+Our test case generator detects deviations at an early stage: 
+The test case generator derives test cases directly from the specification. 
+If the implementation fulfills these test cases, then the implementation fulfills the specification. 
+If the implementation does not fulfill these test cases, the implementation deviates from the specification. 
+With our test case generator, developers can quickly uncover inconsistencies, fix them, and save costs.
+
+# Conventions
+## Repository language
+English
+
+## Review process
+A pull request addresses a single issue. 
+
+A pull request must be approved by two reviewers.
+
+A pull request is squashed before the merge.
+
+## Naming Conventions: Issues, branches, pull requests, squashed merge commits
+Issues describe project work such as tasks, bugs, and feature requests. 
+Example: ```Implement task XYZ```
+
+The branch name follows the issue name. 
+The automatically generated issue ID is succeeded by the issue name in lowercase letters, with hyphens separating multiple words.
+Example: ```#1-implement-task-xyz```
+
+The pull request name is the issue name plus the issue id.
+Example: ```Implement task XYZ (Issue #1)```
+
+The squashed merge commit name is the issue name plus the issue id plus the pull request id. 
+Example: ```Implement task XYZ (Closes #1) (PR #2)```
+
+If a pull request addresses several issues, the pull request name is a summary of the issues plus the issue ids.
+The squashed merge commit name is a summary of the issues plus the issue ids plus the pull request id.
+Example pull request: ```Initial Setup (Issue #1, Issue #2, Issue #3)```
+Example squashed merge commit: ```Initial Setup (Closes #1, Closes #2, Closes #3) (PR #2)```
+
+# Technology and frameworks
+## PlantUML
+Website: [www.plantuml.com](www.plantuml.com)
+
+## Cucumber
+Website: [https://cucumber.io](https://cucumber.io)