Add recipe for mixpanel/mixpanel-php (#1262)

mixpanel/mixpanel-php/2.8/config/packages/mixpanel.yaml

@@ -0,0 +1,8 @@
+services:
+    Mixpanel:
+        class: \Mixpanel
+        factory: ['Mixpanel', 'getInstance']
+        arguments:
+            - '%env(MIXPANEL_PROJECT_TOKEN)%'
+# uncomment if EU resident
+#            - { 'host': 'api-eu.mixpanel.com' }

mixpanel/mixpanel-php/2.8/manifest.json

@@ -0,0 +1,8 @@
+{
+    "copy-from-recipe": {
+        "config/": "%CONFIG_DIR%/"
+    },
+    "env": {
+        "MIXPANEL_PROJECT_TOKEN": ""
+    }
+}