Added NASM linter

Added NASM linter (for nasm filetype).

doc/ale-nasm.txt

@@ -0,0 +1,26 @@
+===============================================================================
+ALE NASM Integration                                         *ale-nasm-options*
+
+
+===============================================================================
+nasm                                                            *ale-nasm-nasm*
+
+g:ale_nasm_nasm_executable                         *g:ale_nasm_nasm_executable*
+                                                   *b:ale_nasm_nasm_executable*
+
+  Type: |String|
+  Default `'nasm'`
+
+  This variable can be changed to use different executable for NASM.
+
+
+g:ale_nasm_nasm_options                               *g:ale_nasm_nasm_options*
+                                                      *b:ale_nasm_nasm_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to pass additional options to NASM.
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -145,6 +145,8 @@ CONTENTS                                                         *ale-contents*
       write-good..........................|ale-markdown-write-good|
     mercury...............................|ale-mercury-options|
       mmc.................................|ale-mercury-mmc|
+    nasm..................................|ale-nasm-options|
+      nasm................................|ale-nasm-nasm|
     nroff.................................|ale-nroff-options|
       write-good..........................|ale-nroff-write-good|
     objc..................................|ale-objc-options|
@@ -360,6 +362,7 @@ Notes:
 * Markdown: `alex`!!, `markdownlint`!!, `mdl`, `prettier`, `proselint`, `redpen`, `remark-lint`, `textlint`, `vale`, `write-good`
 * MATLAB: `mlint`
 * Mercury: `mmc`!!
+* NASM: `nasm`!!
 * Nim: `nim check`!!
 * nix: `nix-instantiate`
 * nroff: `alex`!!, `proselint`, `write-good`