Add 'Efficiency Class'

Efficiency-Class.md

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+Welcome to the Wiki.
+
+## Global variables:
+
+# Classes
+### EffAndError
+* **Private members:**
+* **Public  members:**
+* **Functions:**
+    * **EffAndError()**
+        * **Parameters**
+            * //default constructor
+        * **Return**
+    * **EffAndError()**
+        * **Parameters**
+            * double val //default constructor
+        * **Return**
+    * **EffAndError()**
+        * **Parameters**
+            * double val
+            * double highErr
+            * double lowErr //default constructor
+        * **Return**
+    * **~EffAndError()**
+        * **Parameters**
+            * );   //destuctor
+        * **Return**
+
+
+
+# Functions and their parameters:
+### EffAndError::~EffAndError()
+
+* **Parameters**
+    * //destuctor
+* **Return**
+
+### EffAndError GetEfficiency()
+
+* **Parameters**
+    * TFile \*fitFileNumerator
+    * string nameNumerator
+    * TFile \*fitFileDenominator
+    * string nameDenominator
+* **Return**
+
+### EffAndError getTMEfficiencySimple()
+
+* **Parameters**
+    * string year
+    * int Run
+    * bool UseOnlyMuMuEvents
+    * bool PHSP
+    * bool KshortDecaysInVelo
+    * bool RemoveMultiple
+    * bool weighted
+    * string sExtraVar
+    * int nExtraBin
+    * string customTMbranch
+    * bool gammaTM  //TODO: add customTMbranch and gammaTM
+* **Return**
+
+### EffAndError getBDTEfficiencySimple()
+
+* **Parameters**
+    * string year
+    * Double_t TMVAcut
+    * int Run
+    * bool UseOnlyMuMuEvents
+    * bool PHSP
+    * bool KshortDecaysInVelo
+    * bool IncludeMultipleEff
+    * bool weighted
+    * string sExtraVar
+    * int nExtraBin //TODO: check weight
+* **Return**
+
+### EffAndError getSelectionEfficiencySimple()
+
+* **Parameters**
+    * bool full
+    * string year
+    * int Run
+    * bool  UseOnlyMuMuEvents
+    * bool useRefChannel
+    * bool PHSP
+    * bool KshortDecaysInVelo
+    * bool RemoveMultiple
+    * bool weighted
+    * string sExtraVar
+    * int nExtraBin
+    * string customTMbranch
+    * bool gammaTM  //For studies on variables
+* **Return**