Added filetype txt and ppa

Seeing a lot of txt files that contain PowerShell scripts with encoded AgentTesla binary inside alongside PPA files.

file-type/machinetag.json

@@ -377,6 +377,11 @@
           "expanded": "document",
           "value": "doc"
         },
+        {
+          "colour": "#35b8f0",
+          "expanded": "document",
+          "value": "txt"
+        },
         {
           "colour": "#ccffeb",
           "expanded": "document",
@@ -607,6 +612,11 @@
           "expanded": "code",
           "value": "java-bytecode"
         },
+        {
+          "colour": "#2e73db",
+          "expanded": "code",
+          "value": "ppa"
+        },
         {
           "colour": "#004d2f",
           "expanded": "apple",