updated readme and Dockerfile to allow for tests to be run in container

Former-commit-id: 677ae5487f2b68ddd045e5cf2af3c49d625adef6

Dockerfile

@@ -1,7 +1,10 @@
 FROM ubuntu:18.04
 
+
+
 RUN apt-get update \
-    && apt-get install -qqy build-essential nasm autotools-dev autoconf libjemalloc-dev \
+    && DEBIAN_FRONTEND=noninteractive apt-get install -qqy \
+        build-essential nasm autotools-dev autoconf libjemalloc-dev tcl tcl-dev \
     && apt-get clean
 
 CMD make

README.md

@@ -204,6 +204,26 @@ Future work:
  - Allow rebalancing of connections to different threads after the connection
  - Allow multiple readers access to the hashtable concurrently
 
+Docker Build
+------------
+
+Run the following commands for a full source download and build:
+
+```
+git clone git@github.com:JohnSully/KeyDB.git
+docker run -it --rm `pwd`/KeyDB:/build -w /build devopsdood/keydb-builder make
+```
+
+Then you have fresh binaries built, you can also pass any other options to the make command above after the word make. E.g.
+
+```docker run -it --rm `pwd`/KeyDB:/build -w /build devopsdood/keydb-builder make MAllOC=memkind```
+
+The above commands will build you binaries in the src directory. Standard `make install` without Docker command will work after if you wish to install
+
+If you'd prefer you can build the Dockerfile in the repo instead of pulling the above container for use:
+
+`docker build -t KeyDB .`
+
 Code contributions
 -----------------