Create install_docker_github.md

These steps will walk users through using docker on the latest github code.

docs/install_docker_github.md

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+# Build Docker Image from Github Repo
+The steps below will walk you through installing the application in a docker container from the latest github version.
+
+---
+
+First thing we need to do is clone the github repository
+```bash
+git clone https://github.com/perara/wg-manager.git
+```
+
+Next we need to build the image. This will take some time.
+```bash
+docker build -t wg-manager .
+```
+
+Now that our image is built, we can either launch the container via _docker-compose_ or through the _docker CLI_.
+
+## Docker Compose
+```yaml
+version: "2.1"
+services:
+  wireguard:
+    container_name: wg-manager
+    image: wg-manager
+    restart: always
+    sysctls:
+      net.ipv6.conf.all.disable_ipv6: 0  # Required for IPV6
+    cap_add:
+      - NET_ADMIN
+    network_mode: host
+    ports:
+       - 51802:51802/udp
+       - 8888:8888
+    volumes:
+      - ./wg-manager:/config
+    environment:
+      HOST: 0.0.0.0
+      PORT: 8888
+      ADMIN_USERNAME: admin
+      ADMIN_PASSWORD: admin
+      WEB_CONCURRENCY: 1
+```
+
+## Docker CLI
+```bash
+docker run -d \
+--sysctl net.ipv6.conf.all.disable_ipv6=0 \
+--cap-add NET_ADMIN \
+--name wg-manager \
+--net host \
+-p "51802:51802/udp" \
+-p "8888:8888" \
+-v wg-manager:/config \
+-e HOST="0.0.0.0" \
+-e PORT="8888" \
+-e ADMIN_USERNAME="admin" \
+-e ADMIN_PASSWORD="admin" \
+wg-manager
+```