raft: consensus protocol design doc

doc/internal/parser/scanner/Consensus-Protocol.md

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+# The consensus
+
+Maintaining consensus is one of the major parts of a distributed system. To know to have achieved a stable system, we need the following two parts of implementation.
+
+## The Raft protocol
+
+
+## A strict testing mechanism
+
+The testing mechanism to be implemented will enable us in figuring out the problems existing in the implementation leading to a more resilient system.
+We have to test for the following basic failures:
+1. Network partitioning.
+2. Un-responsive peers.
+3. Overloading peer.
+4. Corruption of data in transit.
+
+## Graceful handling of failures
+
+Accepting failures exist and handling them gracefully enables creation of more resilient and stabler systems. Having _circuit breakers_, _backoff mechanisms in clients_ and _validation and coordination mechanisms_ are some of the pointers to be followed.