Enable IP/Domain Name access. Create detailed README.md

.gitignore

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-node_modules
+node_modules
+server-cert.pem
+server-key.pem

README.md

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+# Dummy installation
+This is repo is forked from [Zoom-Clone-With-WebRTC](https://github.com/WebDevSimplified/Zoom-Clone-With-WebRTC) and here is the [tutorial video](
+https://www.youtube.com/watch?v=DvlyzDZDEq4&t=684s).  
+Since I want to deploy this application and access it by IP address or domain name instead of `loaclhost`, I found [this issue](https://github.com/WebDevSimplified/Zoom-Clone-With-WebRTC/issues/23). After a little bit of modification, it works.  
+
+Tested on ubuntu-mate 18.04 x86_64, VM Player and windows 10, baremetal.
+## Dependencies
+- Of course clone this repo:
+  ```bash
+  git clone https://github.com/WebDevSimplified/Zoom-Clone-With-WebRTC
+  ```
+- Install `nodejs` and `npm`  
+  It's recommanded to use nodejs 10.x or higher. nodejs LTS(12.x) is selected here.  
+  For windows user, please refer: [official download page](https://nodejs.org/en/download/).  
+  ```bash
+  sudo apt-get update
+
+  # in case you don't have them
+  sudo apt-get install curl
+
+  curl -sL https://deb.nodesource.com/setup_12.x | sudo -E bash - # this is for 64 bit machine
+  sudo apt-get install -y nodejs
+  ```
+- Packages of `nodejs`  
+  It's recommanded that windows user run these commands as administrator to prevent some magic bugs.
+  ```bash
+  npm install
+  npm install --save-dev nodemon
+  ```
+
+## Certificate
+If you want to use this application via IP address or domain name instead of `localhost`, this step is necessary. Since most of browsers block media(such as webcam) accessing from unsecure connections, we have to deploy this application with `HTTPS`. This repo comes with the key I generated. You can use it if you don't have `openssl` installed. Yet it's recommanded to generate your own key.  
+Here are commands using `openssl` to generate a key and certificate:
+> For windows user, `openssl` is a built-in command in MINGW64 git-bash.
+> For Linux user, just run these commands in termial.
+```bash
+# install openssl if you don't have it
+sudo apt-get install openssl
+```
+
+```bash
+# generate a key
+openssl genrsa -out server-key.pem
+
+# this step will probably ask you to input the information of the signature,
+# such as country, company name, etc
+openssl req -new -key server-key.pem -out csr.pem
+
+# generate a certificate
+openssl x509 -req -days 9999 -in csr.pem -signkey server-key.pem -out server-cert.pem
+
+# optional: we dont need this, but I think it's okay to keep it
+rm csr.pem
+```
+
+## Run it
+```bash
+sudo npm run devStart
+```
+And you can enter 
+```
+https://your.IP.addr/
+```
+in your borwser. It's likely to have a warning `NET::ERR_CERT_AUTHORITY_INVALID` or somthing like that. For Chrome, just click *Advance*, *Continue...*  
+It will automatically generate a uuid and redirect you to your chatting room. For anyone want to join you, you can just share the url of your chatting room.