Added initial documentation page

Refs #1118

Code/Mantid/docs/source/algorithms/FlatPlatePaalmanPingsCorrection-v1.rst

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+.. algorithm::
+
+.. summary::
+
+.. alias::
+
+.. properties::
+
+Description
+-----------
+
+Calculates absorption corrections for a flat plate sample giving output in the
+Paalman & Pings absorption factors: :math:`A_{s,s}` (correction factor for
+scattering and absorption in sample), :math:`A_{s,sc}` (scattering in sample and
+absorption in sample and container), :math:`A_{c,sc}` (scattering in container
+and absorption in sample and container) and  :math:`A_{c,c}` (scattering and
+absorption in container).
+
+Restrictions on the input workspace
+###################################
+
+The input workspace must have units of wavelength.
+
+Usage
+-----
+
+**Example:**
+
+.. testcode:: exSampleAndCan
+
+    # Create a sample workspace
+    sample = CreateSampleWorkspace(NumBanks=1, BankPixelWidth=1,
+                                   XUnit='Wavelength',
+                                   XMin=6.8, XMax=7.9,
+                                   BinWidth=0.1)
+
+    # Copy and scale it to make a can workspace
+    can = CloneWorkspace(InputWorkspace=sample)
+    can = Scale(InputWorkspace=can, Factor=1.2)
+
+    # Calculate absorption corrections
+    abs = FlatPlatePaalmanPingsCorrection(SampleWorkspace=sample,
+                                          SampleChemicalFormula='H2-O',
+                                          SampleThickness=0.1,
+                                          SampleAngle=45,
+                                          CanWorkspace=can,
+                                          CanChemicalFormula='V',
+                                          CanFrontThickness=0.01,
+                                          CanBackThickness=0.01,
+                                          Emode='Indirect',
+                                          Efixed=1.845)
+
+    print 'Correction workspaces: %s' % ', '.join(abs.getNames())
+
+Output:
+
+.. testoutput:: exSampleAndCan
+
+    Correction workspaces: abs_ass, abs_assc, abs_acsc, abs_acc
+
+.. categories::