Added unittest to check for specific repo files

tests/SendGrid.Tests/RequiredFilesExistTest.cs

@@ -0,0 +1,110 @@
+namespace SendGrid.Tests
+{
+    using System.IO;
+    using Xunit;
+
+    public class TestRequiredFilesExist
+    {
+
+        // ./Docker or docker/Docker
+        public void checkDockerExists() {
+            bool dockerExists = File.Exists("./Dockerfile") ||
+            File.Exists("./docker/Dockerfile");
+            Assert.True(dockerExists);
+        }
+
+        // ./docker-compose.yml or ./docker/docker-compose.yml
+        public void checkDockerComposeExists()
+        {
+            bool dockerComposeExists = File.Exists("./docker-compose.yml") ||
+            File.Exists("./docker/docker-compose.yml");
+            Assert.True(dockerComposeExists);
+        }
+
+        // ./.env_sample
+        public void checkEnvSampleExists()
+        {
+            Assert.True(File.Exists("./.env_sample"));
+        }
+
+        // ./.gitignore
+        public void checkGitIgnoreExists()
+        {
+            Assert.True(File.Exists("./.gitignore"));
+        }
+
+        // ./.travis.yml
+        public void checkTravisExists()
+        {
+            Assert.True(File.Exists("./.travis.yml"));
+        }
+
+        // ./.codeclimate.yml
+        public void checkCodeClimateExists()
+        {
+            Assert.True(File.Exists("./.codeclimate.yml"));
+        }
+
+        // ./CHANGELOG.md
+        public void checkChangelogExists()
+        {
+            Assert.True(File.Exists("./CHANGELOG.md"));
+        }
+
+        // ./CODE_OF_CONDUCT.md
+        public void checkCodeOfConductExists()
+        {
+            Assert.True(File.Exists("./CODE_OF_CONDUCT.md"));
+        }
+
+        // ./CONTRIBUTING.md
+        public void checkContributingGuideExists()
+        {
+            Assert.True(File.Exists("./CONTRIBUTING.md"));
+        }
+
+        // ./.github/ISSUE_TEMPLATE
+        public void checkIssuesTemplateExists()
+        {
+            Assert.True(File.Exists("./.github/ISSUE_TEMPLATE"));
+        }
+
+        // ./LICENSE.md
+        public void checkLicenseExists()
+        {
+            bool licenseExists = File.Exists("./LICENSE.md") ||
+            File.Exists("./LICENSE.txt");
+            Assert.True(licenseExists);
+        }
+
+        // ./.github/PULL_REQUEST_TEMPLATE
+        public void checkPullRequestExists()
+        {
+            Assert.True(File.Exists("./.github/PULL_REQUEST_TEMPLATE"));
+        }
+
+        // ./README.md
+        public void checkReadMeExists()
+        {
+            Assert.True(File.Exists("./README.md"));
+        }
+
+        // ./TROUBLESHOOTING.md
+        public void checkTroubleShootingGuideExists()
+        {
+            Assert.True(File.Exists("./TROUBLESHOOTING.md"));
+        }
+
+        // ./USAGE.md
+        public void checkUsageGuideExists()
+        {
+            Assert.True(File.Exists("./USAGE.md"));
+        }
+
+        // ./USE_CASES.md
+        public void checkUseCases()
+        {
+            Assert.True(File.Exists("./USE_CASES.md"));
+        }
+    }
+}