add HTCondor documentation

README.md

 # DELPHI software simple examples
 This repository shows basic examples of how to run the software stack and perform various tasks.
 
-## [Creating Monte Carlo samples interactively](create_mc.sh)
+## [Creating Monte Carlo samples interactively](scripts/create_mc.sh)
 To creating a few events with a build-in generator run
 ```
 runsim -VERSION va0u -LABO CERN -NRUN 1000 -EBEAM 45.625 -igen qqps -NEVMAX 10
@@ -25,7 +25,55 @@ Created files:
 
 Analysis can be run as well on the full DST output in which case a bunch of packages will be rerun.
 
-## [Running an analysis job interactively](testjob.sh)
+## [Creating Monte Carlo samples on the HTCondor batch farm at CERN](htcondor/create_mc.sub)
+To run the same job on the HTCondor batch farm, you need to follow these steps
+
+### Create a job script
+First, wrap the commands you need to run in a script, eg
+```
+#!/bin/bash
+
+# produce 10 jetset events with build-in generator,
+# simulate
+# reconstruct
+# and create short DST output
+runsim -VERSION va0u -LABO CERN -NRUN 1000 -EBEAM 45.625 -igen qqps -NEVMAX 10
+
+```
+and save this in a file, say: **create_mc.sh**, and ensure that it is executable:
+```
+chmod +x create_mc.sh
+```
+
+### create the submission file for HTCondor
+For HTCondor, unlike LSF, you need to create a submission script which describes the your job. 
+```
+executable            = create_mc.sh
+arguments             = $(ClusterID) $(ProcId)
+output                = output/create_mc.$(ClusterId).$(ProcId).out
+error                 = error/create_mc.$(ClusterId).$(ProcId).err
+log                   = log/create_mc.$(ClusterId).log
+requirements = (OpSysAndVer =?= "CentOS7")
+queue
+```
+Save this in a file called create_mc.sub, for example.
+
+See [the batch documentation at CERN](https://batchdocs.web.cern.ch/batchdocs/local/index.html) for more details.
+The above script will queue your job and ask for resources on CentOS7.
+
+### Submit the job to the system
+Now you can submit your job with
+```
+kinit
+condor_submit create_mc.sub
+```
+The command
+```
+condor_q
+```
+will show you the status of your job.
+
+## [Running an analysis job interactively](scripts/testjob.sh)
 The following script can be run interactively or submitted to a batch farm with DELPHI setup
 
 ```
@@ -82,4 +130,6 @@ It
 * creates a data input fiel which would read **simana.xsdst** from the local folder where the executable will be started
 * runs the job
 
-
+## Running an analysis job on HTCondor
+This works exactly as described above. Save the script above to some file, create a submit file and ensure that the exectuable
+name matches what you need.