Added instructions to create your own package

MakeYourOwnPackage.md

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+# Make your own package
+
+Making your own packages is simple and easy.
+
+1. Open the packages-devel directory
+
+2. Create a JSON file with the details of your program
+
+3. In a terminal, run ```portprog --devel```
+
+4. Run ```environment.bat``` and then test your new package
+
+## The JSON file
+
+What do you put in your JSON file?  Let's take a look at cmder.json
+
+```json
+{
+    	"Name"  :   "cmder",
+    	"Zip"   :   "cmder.7z",
+    	"Url"   :   "https://github.com/cmderdev/cmder/releases/download/v1.3.11/cmder.7z",
+	"Fetch" :	"web",
+	"Plan"  :   "zipWithNoDirectory",
+	"Type"  :   "Application",
+	"BinDir":	"/"
+}
+```
+
+The JSON file contains all the information needed to download and install your program.  Let's take a look at the fields:
+
+* Url - Download the zip from here
+* Zip - The name of the zip file that will appear on disk.  We use wget to download the zips, so you can check this manually with wget
+* Name - is the name of the target directory in the install directory.  See the options ```zipWithDirectory``` and ```zipWithNoDirectory``` for more information
+* Fetch - only web is supported for now
+* Plan - Currently has three options
+	1. ```zipWithDirectory``` - Your program is in a zip file (.zip, .tar, .7z, .rar).  The zip file contains a directory, and all your programs are inside that.  In this case, you MUST use the name of that directory in the ```Name``` field.
+	2. ```zipWithNoDirectory``` - Your program is in a zip file, but all the files are at the top level.  Portprog will create the directory named in the ```Name``` field, and unpack your directory there.
+	3. ```msi``` - You are using an MSI installer package.  The package will be unpacked into the directory named in the ```Name``` field, and your program probably won't work
+	4. There is no 4
+* Type - Only application, for now.  If your zip file doesn't contain an application (e.g. it is just data), leave the field empty
+* BinDir - The directory, _inside the zip file_, that contains the executables for your program.  Usually "/bin" or just "/"
+
+Good luck and enjoy!