Create README.md

src/AssetClass/README.md

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+## How Cashflow Projection Work
+
+### Steps
+
+* determine the projection dates
+
+  * start date -> There is a field in asset present the `origination date` ,which means the date when asset came into existance.
+  * (original/scheduled) payment dates -> Then, cashflow engine will generate a vector of payment dates bases on `origination date` and `payment frequency`
+  * remaining payment dates -> base on the input field `remaining terms`, engine will trancate the `payment dates` to get `remaining payment dates`
+
+* project cashflow with assumptions
+
+  * projected cashflow -> Given `remaining payment dates` and `current balance` , then engine will calculate cashflow with assumption starting from `remaining payment dates`
+
+* truncate the cashflow via `cutoff date`
+
+  * `projected cashflow` was truncated via `cutoff date` ,that's the cashflow of asset which flows into the SPV
+