Added preliminary quickstart checklist to help getting steemd up and …

…running

while avoiding most common issues for certain use cases

doc/quickstart.md

@@ -0,0 +1,52 @@
+Quickstart
+----------
+
+### Get current steemd
+#### Docker
+Preferred way is to use docker.
+#### Building
+If you can't or don't want to use Docker and you want to build `steemd` and `cli_wallet` yourself follow [build instructions](building.md). 
+Those was made for `Ubuntu 16.04 LTS` and `macOS`.
+If you have troubles building, please use Docker.
+
+#### Low memory node?
+Unless you run full api node, use
+`LOW_MEMORY_NODE=ON`
+Suitable for:
+- seed nodes
+- witness nodes
+- exchanges, etc.
+For full api node use `LOW_MEMORY_NODE=OFF`
+
+### Configure for your use case
+#### Full API node
+Do not use low memory node for this case:
+`LOW_MEMORY_NODE=OFF`
+Use `contrib/fullnode.config.ini` as a base for your `config.ini` file.
+
+#### Exchanges
+Use low memory node:
+`LOW_MEMORY_NODE=ON`
+Also make sure that your `config.ini` contains:
+```
+enable-plugin = account_history
+public-api = database_api login_api
+track-account-range = ["yourexchangeid", "yourexchangeid"]
+```
+Do not add other APIs or plugins unless you know what you are doing.
+
+### Resources usage
+
+Please make sure that you have enough resources available.
+Provided values are expected to grow significantly over time.
+
+Blockchain data takes over **12GB** of storage space.
+
+#### Full node
+Shared memory file for full node uses over **45GB**
+
+#### Seed node
+Shared memory file for seed node uses over **3GB**
+
+#### Other use cases
+Shared memory file size varies, depends on your specific configuration but it is expected to be somewhere between "seed node" and "full node" usage.