Add reverse proxy content

* Update 100-reverse-proxy.md

* Update 100-reverse-proxy.md

content/roadmaps/102-devops/content/104-setting-up-x/100-reverse-proxy.md

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-# Reverse proxy
+# Reverse Proxy
+
+A Reverse Proxy server is a type of proxy server that typically sits behind the firewall in a private network and directs client requests to the appropriate backend server. It provides an additional level of security by hiding the server related details like `IP Address` to clients. It is also known as **server side proxy**.
+
+**Common Uses:**
+
+* Load balancing
+* Web acceleration
+* Security and anonymity
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.cloudflare.com/en-gb/learning/cdn/glossary/reverse-proxy/'>What is Reverse Proxy?</BadgeLink>
+<BadgeLink badgeText='Read' href='https://www.nginx.com/resources/glossary/reverse-proxy-server/'>NGINX documentation</BadgeLink>