Added example state test

StateTests/stExample.json

+{
+    "add11" : {
+        "env" : {
+            "currentCoinbase" : "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba",
+            "currentDifficulty" : "256",
+            "currentGasLimit" : "1000000",
+            "currentNumber" : "0",
+            "currentTimestamp" : 1,
+            "previousHash" : "5e20a0453cecd065ea59c37ac63e079ee08998b6045136a8ce6635c7912ec0b6"
+        },
+        "out" : "0x",
+        "post" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "1000000000000100000",
+                "code" : "0x6001600101600057",
+                "nonce" : "0",
+                "storage" : {
+                    "0x" : "0x02"
+                }
+            },
+            "2adc25665018aa1fe0e6bc666dac8fc2697ff9ba" : {
+                "balance" : "804",
+                "code" : "0x",
+                "nonce" : "0",
+                "storage" : {
+                }
+            },
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "999999999999899196",
+                "code" : "0x",
+                "nonce" : "1",
+                "storage" : {
+                }
+            }
+        },
+        "pre" : {
+            "095e7baea6a6c7c4c2dfeb977efac326af552d87" : {
+                "balance" : "1000000000000000000",
+                "code" : "0x6001600101600057",
+                "nonce" : 0,
+                "storage" : {
+                }
+            },
+            "a94f5374fce5edbc8e2a8697c15331677e6ebf0b" : {
+                "balance" : "1000000000000000000",
+                "code" : "",
+                "nonce" : 0,
+                "storage" : {
+                }
+            }
+        },
+        "transaction" : {
+            "data" : "",
+            "gasLimit" : "10000",
+            "gasPrice" : "1",
+            "nonce" : "0",
+            "secretKey" : "45a915e4d060149eb4365960e6a7a45f334393093061116b197e3240065ff2d8",
+            "to" : "095e7baea6a6c7c4c2dfeb977efac326af552d87",
+            "value" : "100000"
+        }
+    }
+}
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