Added library maintainance instructions

amd/src/bootstrap-vue/readme-moodle.txt

@@ -1,4 +1,4 @@
-Instructions for recreation:
+Instructions for downloading and integrating bootstrap-vue
 
 1. download bootstrap-vue distribusion throuhg npm
    npm install bootstrap-vue@2.23.1

amd/src/portal-vue/readme-moodle.txt

@@ -0,0 +1,18 @@
+Instructions for downloading and integrating portal-vue
+
+1. download bootstrap-vue distribusion throuhg npm
+   npm install portal-vue
+
+2. Copy node_modules/portal-vue/dist/portal-vue.esm.js to amd/src/portal-vue
+
+3. Change import statements on top of bootstrap-vue.esm to:
+
+   /* Modification to handle relative loading of vue */
+   // Import Vue from dev or prod depending on the developerdebug setting.
+   // (Importing both dev and prod seems easier than using dynamic imports, but I could be mistaken)
+   import Config from "core/config";
+   import VueDev from '../vue/dev/vue';
+   import VueProd from '../vue/prod/vue';
+   const Vue = Config.developerdebug?VueDev:VueProd;
+   /* End modification */
+

amd/src/simpleline/readme-moodle.txt

@@ -0,0 +1,4 @@
+Instructions for downloading and integrating SimpleLine
+
+1. Download simpleline.js and any support .js files from https://github.com/miqraeng/simpleline
+2. Copy them to this location