instal doc update

LINUX.md

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+## Installing Common Lisp + CLOG Builder on Linux (all platforms)
+
+(For emacs based Linux install - https://lisp-lang.org/learn/getting-started/)
+
+1. Install sbcl, emacs, sqlite and openssh (modify for your OS)
+
+sudo apt-get install sbcl openssh-client libsqlite3-dev
+
+2. Install QuickLisp
+```
+curl -o /tmp/ql.lisp http://beta.quicklisp.org/quicklisp.lisp
+sbcl --no-sysinit --no-userinit --load /tmp/ql.lisp \
+       --eval '(quicklisp-quickstart:install :path "~/.quicklisp")' \
+       --eval '(ql:add-to-init-file)' \
+       --quit
+```
+
+3. Run SBCL and install the UltraLisp distro for recent software for quicklisp:
+
+```
+(ql-dist:install-dist "http://dist.ultralisp.org/"
+                      :prompt nil)
+(ql:update-all-dists) ; run newest updates
+```
+
+4. Install and run CLOG Builder for a rich GUI Lisp IDE either with:
+
+```
+   (ql:quickload :clog/tools)
+   (clog-tools:clog-builder)
+```
+
+or at the command line:
+
+```
+run-builder
+```
+
+-  [Learn about CLOG](README.md)
+-  [Learn Common-Lisp](LEARN.md)