Create download-and-open-genvisis.md

GetStarted/download-and-open-genvisis.md

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+## Download and Open Genvisis
+
+1. [Download Genvisis and a Genvisis starter project](https://genvisis.org/#/download).
+2. Run **genvisis.jar**.
+    * For Linux or Mac, or if you are running remotely on Linux:
+        * Open a terminal and run **java -Xmx#g -jar [path]/genvisis.jar**
+         * **#g** is the number of gigabytes of memory to use
+         * [path] is the location of the genvisis.jar file
+         * Example
+             * **java -Xmx24g -jar ~/genvisis.jar** (if **genvisis.jar** is saved in your home directory)
+        * Alternatively, locate **genvisis.jar** within a file manager and double-click on the Genvisis icon
+    * For Windows:
+        * Open a text file and write inside **java -Xmx#g -jar genvisis.jar**
+        * **#g** is the number of gigabytes of memory to use
+        * Example: **java -Xmx24g -jar genvisis.jar**
+        * Save the text file as **vis.bat** in the same directory as **genvisis.jar**
+        * Double-click **vis.bat**
+
+![Image of Genvisis opened for the first time](/Images/GenvisisOpened.png)