update README for golang node perl php python

update the README to include the way to cusomize
the container image with debug capabilities.

Signed-off-by: Liu, Jianjun <jianjun.liu@intel.com>

golang/README.md

@@ -80,6 +80,8 @@ modify the container images.
     docker build -t clearlinux/golang .
     ```
 
+4. Please refer to [create custom application container image](https://github.com/clearlinux/clear-linux-documentation/pull/775) on how to customize your container image with specific debug capabilities, such as: make, git.
+
    Refer to the Docker documentation for [default build arguments](https://docs.docker.com/engine/reference/builder/#arg).
    Additionally:
    

node/README.md

@@ -99,6 +99,8 @@ modify the container images.
     docker build -t clearlinux/node .
     ```
 
+4. Please refer to [create custom application container image](https://github.com/clearlinux/clear-linux-documentation/pull/775) on how to customize your container image with specific debug capabilities, such as: make, git.
+
    Refer to the Docker documentation for [default build arguments](https://docs.docker.com/engine/reference/builder/#arg).
    Additionally:
    

perl/README.md

@@ -76,6 +76,7 @@ modify the container images.
     ```
     docker build -t clearlinux/perl .
     ```
+4. Please refer to [create custom application container image](https://github.com/clearlinux/clear-linux-documentation/pull/775) on how to customize your container image with specific debug capabilities, such as: make, git.
 
    Refer to the Docker documentation for [default build arguments](https://docs.docker.com/engine/reference/builder/#arg).
    Additionally:

php/README.md

@@ -155,6 +155,8 @@ modify the container images.
     docker build -t my-own-php-instance .
     ```
 
+4. Please refer to [create custom application container image](https://github.com/clearlinux/clear-linux-documentation/pull/775) on how to customize your container image with specific debug capabilities, such as: make, git.
+
    Refer to the Docker documentation for [default build
    arguments](https://docs.docker.com/engine/reference/builder/#arg).
    Additionally:

python/README.md

@@ -77,6 +77,8 @@ modify the container images.
     docker build -t clearlinux/python .
     ```
 
+4. Please refer to [create custom application container image](https://github.com/clearlinux/clear-linux-documentation/pull/775) on how to customize your container image with specific debug capabilities, such as: make, git.
+
    Refer to the Docker documentation for [default build arguments](https://docs.docker.com/engine/reference/builder/#arg).
    Additionally: