Adding Big Data module

courses/big_data/overview.md

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+# Overview of Big Data
+
+1. Big Data is a collection of large datasets that cannot be processed using traditional computing techniques. It is not a single technique or a tool, rather it has become a complete subject, which involves various tools, techniques and frameworks.
+2. Big Data could consist of
+    1. Structured data
+    2. Unstructured data
+    3. Semi-structured data
+3. Characteristics of Big Data:
+    4. Volume
+    5. Variety
+    6. Velocity
+    7. Variability
+4. Examples of Big Data generation include stock exchanges, social media sites, jet engines, etc.