Added README with build instructions.

README.md

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+
+# Space-Ace
+
+## Build Requirements
+
+- cmake
+- git
+- g++
+- libsqlite3-dev
+
+## Building under linux
+
+The `git ... --depth 1` is a sparse checkout.  It only pulls the latest source, it doesn't pull down the full git history.
+
+```
+git clone github:stevet11/space-ace.git --depth 1
+cd space-ace
+git clone https://github.com/stevet11/door.git door++ --depth 1
+git clone https://github.com/SRombauts/SQLiteCpp.git --depth 1
+git clone https://github.com/jbeder/yaml-cpp.git --depth 1
+mkdir build
+cd build
+cmake ..
+make
+```
+
+## Calling from a BBS
+
+### Enigma 1/2
+
+In the config/menus/*-doors.hjson file add these entries:
+
+```
+    {
+        value: { command: "S" }
+        action: [
+            {
+                acs: EC0
+                action: @menu:doorAce
+            }
+            {
+                /* acs: EC1 */
+                action: @menu:doorAceU8
+            }
+        ]
+    }
+```
+
+```
+    doorAce: {
+        desc: Space Ace
+        module: abracadabra
+        config: {
+            name: Space Ace
+            dropFileType: DOOR
+            cmd: /home/enigma/bbs/doors/spaceace.sh
+            args: [
+                "{dropFilePath}"                    
+            ]
+            nodeMax: 0
+            tooManyArt: DOORMANY
+            io: stdio
+        }            
+    }
+```
+
+```
+    doorAceU8: {
+        desc: Space Ace
+        module: abracadabra
+        config: {
+            name: Space Construct
+            dropFileType: DOOR
+            cmd: /home/enigma/bbs/doors/spaceace.sh
+            args: [
+                "{dropFilePath}"                    
+            ]
+            nodeMax: 0
+            tooManyArt: DOORMANY
+            io: stdio
+            encoding: utf8
+        }            
+    }
+```
+
+spaceace.sh
+
+```
+#!/bin/bash
+trap "" SIGINT
+
+cd /home/enigma/bbs/doors/spaceace/
+./space-ace -d $1 
+```
+
+While space-ace can detect CP437/unicode, under Enigma it can't.
+
+### Talisman
+
+In menus/doors.toml add an entry:
+
+```
+[[menuitem]]
+command = "RUNDOOR"
+hotkey = "S"
+data = "doors/spaceace.sh"
+```
+
+In the doors directory, create spaceace.sh:
+
+```
+#!/bin/bash
+trap "" SIGINT
+
+cd doors/spaceace
+./space-ace -d ../../temp/$1/door.sys
+```
+
+And space-ace would be in doors/spaceace directory.
+
+Look for space-ace.yaml, space-ace.log, and space-data.db to be created on first run.