added the paste-latex-image script

paste-latex-image/info.json

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+{
+  "name": "Paste Latex Image",
+  "identifier": "paste-latex-image",
+  "script": "paste-latex-image.qml",
+  "version": 0.1,
+  "description" : "This script creates a menu item and a button that generates and pastes an image from Latex code in the clipboard",
+}

paste-latex-image/paste-latex-image.qml

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+import QtQml 2.0
+import com.qownnotes.noteapi 1.0
+
+/**
+ * This script creates a menu item and a button that generates and pastes an image from
+ * Latex code in the clipboard
+ */
+QtObject {
+    /**
+     * Initializes the custom action
+     */
+    function init() {
+        // create a menu entry to paste Latex code as an image
+        script.registerCustomAction("pasteLatexImage", "Paste Latex image", "Latex", "insert-image", true);
+    }
+
+    /**
+     * This function is invoked when a custom action is triggered
+     * in the menu or via button
+     * 
+     * @param identifier string the identifier defined in registerCustomAction
+     */
+    function customActionInvoked(identifier) {
+        switch (identifier) {
+            case "pasteLatexImage":
+                // get the text that is currently in the clipboard
+                var text = script.clipboard();
+
+                // use the webservice to generate and download the image
+                var url = "http://latex.codecogs.com/gif.latex?" + text;
+                var markdown = script.downloadUrlToMedia(url);
+                
+                // write the image markdown to the note
+                script.noteTextEditWrite(markdown);
+                break;
+        }
+    }
+}