Update 'README.md'

README.md

@@ -35,10 +35,19 @@ or guides from the community. A few are linked below. This list is not exhaustiv
 
 ## Docs
 
+### Prerequisites
+
+- 1-2GB of free HDD space (yeah it sucks, Alpine Linux soontm)
+- `m4` and `awk` in remotely recent versions
+- `curl` or `wget` if you want smarter build caches and commands like `./pleroma mod`
+- `jq` and `dialog` if you want to use `./pleroma mod`
+- Bash 4.0+ (fancy scripting stuff)
+- Docker 18.06.0+ and docker-compose 1.22.0-rc1+ (We need compose file format 3.7+ for `init:`)
+
 ### Installation
 
 - Clone this repository
-- Create a `config.exs` and `.env`
+- Create a `config.exs` and `.env` file
 - Run `./pleroma build` and `./pleroma up`
 - Profit!