Add case study#3's sources

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+## Case Study #3: In-DRAM Bitwise Operations
+
+### Instructions
+
+1. run `make` to compile the DRAM Bender program
+2. execute `run_tests.sh` to generate data under `results` directory
+
+### Data format
+
+`run_tests.sh` creates one result file for each iteration of an AND and an OR experiment. For example, `AND-log1.csv` contains the results for the first iteration of an AND experiment.
+
+A line in this file corresponds to a tested DRAM segment and contains the following comma separated information (taken from test.cpp, line 299):
+
+```
+row: The address of the first row in the tested segment
+op_type: "AND" or "OR"
+dp1: Value stored in the first operand
+dp2: Value stored in the second operand
+t1: Distance between the first ACT and the first PRE command
+t2: Distance between the first PRE and the second ACT command
+platext: Placement of the operands (see lines 244-264 in test.cpp)
+errors: Number of bit errors in the output
+```
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