Adding pdf generation capabilities

_pages/docs/using_hmc.md

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 excerpt: "Using HMC"
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-
-### Using HMC
-
 Using HMC in Grid version 0.7.0
 
 These are the instructions to use the Generalised HMC on Grid version 0.7.0.
 Disclaimer: GRID is still under active development so any information provided here can be changed in future releases.
 
+General
+=======
+
+$$ \mathbf{X}\_{n,p} = \mathbf{A}\_{n,k} \mathbf{B}\_{k,p} $$
+
+$$ \langle O \rangle = \int O e^{-S(\psi)} d\psi $$ 
 
 Command line options
-===================
-(relevant file GenericHMCrunner.h)
+====================
+
+(relevant file `GenericHMCrunner.h`)
 List of command line options, specific for HMC
 
 * ```--StartingType  <string>```