Minimal config in installation guide (#11339)

+ Adds a subsection to the installation guide that mentions the requirement for a minimal config to start Frigate successfully.

+ Adds a warning not to proceed any further into the guide without this valid config

docs/docs/frigate/installation.md

@@ -53,6 +53,9 @@ Users of the Snapcraft build of Docker cannot use storage locations outside your
 
 :::
 
+### Creating a minimal configuration
+For Frigate to start, you will need to have a valid configuration file inside your `config/` directory mentioned in the storage section of this page. You can find a minimal reference configuration with a dummy camera on the [full reference config page](https://docs.frigate.video/configuration/reference/).
+
 ### Calculating required shm-size
 
 Frigate utilizes shared memory to store frames during processing. The default `shm-size` provided by Docker is **64MB**.
@@ -78,6 +81,12 @@ $ python -c 'print("{:.2f}MB".format(((1280 * 720 * 1.5 * 9 + 270480) / 1048576)
 
 The shm size cannot be set per container for Home Assistant add-ons. However, this is probably not required since by default Home Assistant Supervisor allocates `/dev/shm` with half the size of your total memory. If your machine has 8GB of memory, chances are that Frigate will have access to up to 4GB without any additional configuration.
 
+:::warning
+
+Before proceeding, make sure you have setup a valid, minimal configuration, or full configuration if you already know what you are doing!
+
+:::
+
 ### Raspberry Pi 3/4
 
 By default, the Raspberry Pi limits the amount of memory available to the GPU. In order to use ffmpeg hardware acceleration, you must increase the available memory by setting `gpu_mem` to the maximum recommended value in `config.txt` as described in the [official docs](https://www.raspberrypi.org/documentation/computers/config_txt.html#memory-options).