Added git, slack, messaging queues, serverless content (#2169)

Co-authored-by: arbhard2 <arbhard2@cisco.com>

content/roadmaps/114-software-architect/content/106-architect-tools/100-git.md

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-# Git
+# Git
+
+Git is a free and open source distributed version control system designed to handle everything from small to very large projects with speed and efficiency.
+
+<ResourceGroupTitle>Reference Resource</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://git-scm.com/'>Git</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Official Docs' href='https://git-scm.com/doc'>Git Documentation</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.atlassian.com/git/tutorials/what-is-git'>All about Git</BadgeLink>

content/roadmaps/114-software-architect/content/106-architect-tools/101-slack.md

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-# Slack
+# Slack
+
+Slack is a messaging app for business that connects people to the information that they need. By bringing people together to work as one unified team, Slack transforms the way that organisations communicate.
+
+<ResourceGroupTitle>Reference Resource</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Website' href='https://slack.com'>Slack</BadgeLink>
+<BadgeLink badgeText='Watch' href='https://www.youtube.com/watch?v=q19RtuCHt1Q'>What is Slack?</BadgeLink>
+<BadgeLink colorScheme='blue' badgeText='Official Docs' href='https://slack.com/intl/en-in/help/categories/360000049043'>Getting Started</BadgeLink>

content/roadmaps/114-software-architect/content/107-architectures/100-serverless.md

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-# Serverless
+# Serverless
+
+Serverless architecture (also known as serverless computing or function as a service, FaaS) is a software design pattern where applications are hosted by a third-party service, eliminating the need for server software and hardware management by the developer. Applications are broken up into individual functions that can be invoked and scaled individually.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Docs' href='https://aws.amazon.com/lambda/serverless-architectures-learn-more/'>Serverless Architectures By AWS</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://martinfowler.com/articles/serverless.html'>Serverless in Detail</BadgeLink>

content/roadmaps/114-software-architect/content/110-apis-and-integrations/105-messaging-queues.md

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-# Messaging queues
+# Messaging queues
+
+Message queuing makes it possible for applications to communicate asynchronously, by sending messages to each other via a queue. A message queue provides temporary storage between the sender and the receiver so that the sender can keep operating without interruption when the destination program is busy or not connected.
+
+<ResourceGroupTitle>Reference Resource</ResourceGroupTitle>
+<BadgeLink colorScheme='blue' badgeText='Official Docs' href='https://aws.amazon.com/message-queue/'>Messaging Queues</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.tutorialspoint.com/inter_process_communication/inter_process_communication_message_queues.htm'>Messaging Queues Tutorial</BadgeLink>