add readme with guide

README.md

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+# Brainlet
+Brainlet is a simple chat app. Each category has a text channel associated with it, all messages sent in the text channel are temporary, while in the category itself all posts are permanent.
+
+
+As its database, it uses Mongo DB.
+## Self-hosting
+So you wanna host Brainlet yourself, huh?
+
+Firstly, you're gonna need a MongoDB server, I just use Docker for the Mongo server, but you can *try* to not use Docker, though Mongo does not want to standalone on anything outside a perfect debian system or windows, so just use Docker. (if you are on windows, simply install mongo normally, it should work nicely)
+
+Let create a Docker container for Mongo!
+```
+docker run -it -v mongodata:/data/db -p 27017:27017 --name mongodb -d mongo
+```
+This should automatically run it, however, next time you need it you gotta run:
+```
+docker start mongodb
+```
+Stopping it is as simple as:
+```
+docker stop mongodb
+```
+
+Now that we have a Mongo server set up, let's actually begin to set up the Brainlet server.
+
+***NOTE***: You need nodejs and npm installed in order to proceed! I recommend using node 12.x, but anything above that will probably work.
+
+
+Once you have installed node, clone the repo and then cd into it.
+Then, run the following command:
+```
+npm i
+```
+This will install all of the node modules.
+
+Then, run:
+```
+cp secret.js.template secret.js
+```
+This will create a new secret.js based on that template.
+
+***IMPORTANT***: Open secret.js with your favourite editor, and set the jwtPrivateKey variable to a random string of characters, preferably generated from /dev/random or using node's own generation thing.
+
+
+***NOTE***: You can edit config.js to tweak some of the settings. You might wanna do that, especially if you are planning to run it on a domain. (setting the address variable)
+
+
+### You should now be ready to go!
+Just run Brainlet with the command below:
+```
+node index.js
+```
+
+Good luck!