Adding Common Issues section.

Most of this is taken from forum or from config.txt (and added new one for Windows 7 Home computers).  Consolidating information here.

README.md

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+### Common Issues
+
+**SeLockMemoryPrivilege failed**
+
+Please see [config.txt](config.txt) under section **LARGE PAGE SUPPORT**
+
+For Windows 7 pro, or Windows 8 and above see [this article](https://msdn.microsoft.com/en-gb/library/ms190730.aspx)  (make sure to reboot afterwards!).
+
+For Windows 7 Home :
+
+1) Download and install [Windows Server 2003 Resource Kit Tools](https://www.microsoft.com/en-us/download/details.aspx?id=17657).  Ignore incompatiablity warning during installation.
+
+2) In cmd or power shell: `ntrights -u %USERNAME% +r SeLockMemoryPrivilege`  (where %USERNAME% is the user that will be running the program.  This command needs to be run as admin)
+
+3) Reboot.
+
+Reference: http://rybkaforum.net/cgi-bin/rybkaforum/topic_show.pl?pid=259791#pid259791
+
+*Warning: do not download ntrights.exe from any other site other then the offical Microsoft download page.*
+
+**msvcp140.dll and vcruntime140.dll not available errors**
+
+Download and install this [runtime package](https://www.microsoft.com/en-us/download/details.aspx?id=48145) from Microsoft.  *Warning: Do NOT use "missing dll" sites - dll's are exe files with another name, and it is a fairly safe bet that any dll on a shady site like that will be trojaned.  Please download offical runtimes from Microsoft above.*
+
+
+**Error: MEMORY ALLOC FAILED: mmap failed**
+
+From [config.txt](config.txt):
+
+On Linux you will need to configure large page support `sudo sysctl -w vm.nr_hugepages=128` and increase your
+ulimit -l. To do do this you need to add following lines to /etc/security/limits.conf:
+
+    * soft memlock 262144
+    * hard memlock 262144
+    
+Save file.  You WILL need to log out and log back in for these settings to take affect on your user (no need to reboot, just relogin in your session).
+   
+You can also do it Windows-style and simply run-as-root, but this is NOT recommended for security reasons.
+
+**Illegal instruction (core dumped)**
+
+This typically means you are trying to run it on a CPU that does not have [AES](https://en.wikipedia.org/wiki/AES_instruction_set).  This only happens on older version of miner, new version gives better error message (but still wont' work since your CPU doesn't support the required instructions).
+
+
+