Manual Plugin installation on Craft 3 I'm trying to manually install a plugin Pic Puller for Craft 3 Beta.

My shared hosting won't allow enabling of allow_url_fopen so it can't be done via the plugin store within the dashboard. 

Any docs I checked are telling me to add the plugin files to /craft/plugins/ but I'm not seeing this directory in Craft 3. 

I tried adding it to the /modules/ directory but this didn't work for me.

Thanks!
You have to create the folder where you want to include your plugins by yourself. There are no requirements how you name it. Let's say you want to create the folder plugins in your Craft folder, then you have to include the plugin in your composer.json like this

"require": {
   "php": "&gt;=7.0.0",
   ....
   "namespace/pluginhandle": "your version",
   "secondred/form-builder": "^1.0" (&lt;--- example how it could look like)
},
"repositories": [
{
  "type": "path",
  "url": "plugins/yourPluginFolderName"
},
{
  "type": "path",   
  "url": "plugins/form-builder" (&lt;--- example how it could look like)
},
....


Then you'll need access to your server via ssh and do composer update