* Added CHANGELOG.md, using the keepachangelog.com template

* Added initial GitLab CI pipeline

.gitlab-ci.yml

+image: "microsoft/dotnet:2.2-sdk"
+
+stages:
+  - "build"
+  - "test"
+#  - "pack"
+#  - "deploy"
+#  - "release"
+
+before_script:
+  - "dotnet restore"
+
+build:
+  script: "dotnet build"
+  artifacts:
+    paths:
+      - "./out/"
+
+test:
+  script: "dotnet test TerminalTests"
+  
+

CHANGELOG.md

+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.1.0] - 2019-06-27
+### Added
+- Simple Application class as the entry point into a terminal application
+- Abstract Command class that can be extend and configure itself to accept arguments/options
+- Arguments/options framework in order to define and validate command line arguments and options
+- A license: MIT :)
+- A readme
+- A changelog, this one!