Readme added.

Author: Rajesh

README.md

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+# RabbitMQ NodeJS - Basics, Direct and Topic based
+
+---
+
+## Table of contents
+- Prerequisites
+- Types
+- Running Application
+- References
+
+### Prerequisites
+
+| Tool | Version |
+| :--- | ------- |
+| **Node JS** | 12.13.0 (LTS) |
+| **rabbitmq_server** | 3.8.2 |
+
+### Types
+
+1. One to One (Direct)
+
+    > For one to one messaging, a producer sends messages to specified queue. A consumer receives messages from that queue.To ensure message is not lost, message acknowledgments can be sent back to producer to confirm a particular message has been received
+
+    > File path - "./rbmq_basic/rbmq.producer and ./rbmq_basic/rbmq.consumer"
+
+    > [Ref: One to One (direct)](https://robomq.readthedocs.io/en/latest/one-one/)
+
+2. Routing - Filter Based (Topic)
+
+    > For filter based routing, a producer declares the topic exchange when publishing a message. Messages sent with a particular routing key will be delivered to all the queues that are bound with a matching binding key. Filter based routing provides a method to use filter policies on routing key for choosing the recipients of messages.
+
+    > <span>&ast;</span> (star) can substitute for exactly one word.
+    > Example: 'topic.*' can be : topic1, topic2, topic3 etc.
+
+    > <span>#</span> (hash) can substitute for zero or more words.
+    > Example: "#.topic" can be: topic, Ftopic, Secondtopic, 123topic etc.
+
+    > File path - "./topic"
+
+    > [Ref: Routing - Filter Based (Topic)](https://robomq.readthedocs.io/en/latest/topic/)
+
+### Running Application
+
+1. One to One (Direct)
+
+    > Under roor directory
+
+    > cd direct
+
+    > node index.js
+
+    > node consumer.js
+
+2. Routing - Filter Based (Topic)
+
+    > Under roor directory
+
+    > cd topic
+
+    > node index.js
+
+    > node consumer.js
+
+```console
+foo@bar: ~$ curl --location --request POST 'http://localhost:3343/api/v1/save' \
+--header 'Content-Type: application/json' \
+--data-raw '[
+    {
+        "postId": 1,
+        "id": 1,
+        "name": "id labore ex et quam laborum",
+        "email": "[email protected]",
+        "body": "laudantium enim quasi est quidem magnam voluptate ipsam eos\ntempora quo necessitatibus\ndolor quam autem quasi\nreiciendis et nam sapiente accusantium"
+    }
+]'
+```
+
+### References
+
+1. [Downloading and Installing RabbitMQ](https://www.rabbitmq.com/download.html)
+2. [AMQP 0-9-1 Model Explained](https://www.rabbitmq.com/tutorials/amqp-concepts.html)
+3. [AMQP](https://robomq.readthedocs.io/en/latest/AMQP/)
+4. [RabbitMQ Tutorials](https://www.rabbitmq.com/getstarted.html)
+5. [Enable Management Plugin](https://www.rabbitmq.com/management.html#getting-started)