Add CI and CD

glossary/Continuous-Deployment.md

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+### Continuous Deployment
+
+Continuous Deployment follows the testing that happens during Continuous Integration and pushes changes to a staging or production system. 
+Continuous Deployment ensures that a version of the codebase is accessible at all times.

glossary/Continuous-Integration.md

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+### Continuous Integration
+
+Continuous Integration (CI) is the practice of testing each change done to a codebase automatically and as early as possible.
+Two popular CI systems that integrate with GitHub are Travis CI and Circle CI.