[help] Add license file to Win instructions

Add the file COPYING to the installation instructions for Windows 1.7.0 installation when utilizing GitHub artifacts.

Author: dave-kaye

help/CelestiaGuide.html

@@ -125,7 +125,7 @@ <h2>Getting Started Topics</h2>
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-                                                    Return to the main page of the Celestia GitHub repository. Click on the green "Code" button in the upper right hand corner, and select download as zip file. Unzip the file to find the Celestia-master folder. From this folder copy the files <i>*.cel</i>, <i>*.png</i>, <i>celestia.cfg</i>, <i>controls.txt</i> and the folders <i>fonts</i>, <i>help</i>, <i>images</i>, and <i>scripts</i> to your Celestia folder.  If multi-language support is desired, the artifacts files have <i>*.gmo</i> and <i>res_*.dll</i> files in <i>po</i> and <i>res</i> folders that can be used for individual languages. This will complete the installation of the Celestia program section. <b>The developmental version does not come with the data files needed to run Celestia.</b> See <a href="#morecontent"><u>Additional Celestia Content</u></a> for information to download and install these necessary files.
+                                                    Return to the main page of the Celestia GitHub repository. Click on the green "Code" button in the upper right hand corner, and select download as zip file. Unzip the file to find the Celestia-master folder. From this folder copy the files <i>*.cel</i>, <i>*.png</i>, <i>celestia.cfg</i>, <i>controls.txt</i>, <i>COPYING</i> and the folders <i>fonts</i>, <i>help</i>, <i>images</i>, and <i>scripts</i> to your Celestia folder.  If multi-language support is desired, the artifacts files have <i>*.gmo</i> and <i>res_*.dll</i> files in <i>po</i> and <i>res</i> folders that can be used for individual languages. This will complete the installation of the Celestia program section. <b>The developmental version does not come with the data files needed to run Celestia.</b> See <a href="#morecontent"><u>Additional Celestia Content</u></a> for information to download and install these necessary files.
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                                                 <li><b>Linux and Unix</b>
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