Add markdown images (#16)

specification/ORCv0.md

@@ -27,7 +27,7 @@ include the minimum and maximum values for each column in each set of
 file reader can skip entire sets of rows that aren't important for
 this query.
 
-![ORC file structure](/img/OrcFileLayout.png)
+![ORC file structure](./img/OrcFileLayout.png)
 
 # File Tail
 
@@ -158,7 +158,7 @@ All of the rows in an ORC file must have the same schema. Logically
 the schema is expressed as a tree as in the figure below, where
 the compound types have subcolumns under them.
 
-![ORC column structure](/img/TreeWriters.png)
+![ORC column structure](./img/TreeWriters.png)
 
 The equivalent Hive DDL would be:
 
@@ -381,7 +381,7 @@ for a chunk that compressed to 100,000 bytes would be [0x40, 0x0d,
 that as long as a decompressor starts at the top of a header, it can
 start decompressing without the previous bytes.
 
-![compression streams](/img/CompressionStream.png)
+![compression streams](./img/CompressionStream.png)
 
 The default compression chunk size is 256K, but writers can choose
 their own value. Larger chunks lead to better compression, but require

specification/ORCv1.md

@@ -27,7 +27,7 @@ include the minimum and maximum values for each column in each set of
 file reader can skip entire sets of rows that aren't important for
 this query.
 
-![ORC file structure](/img/OrcFileLayout.png)
+![ORC file structure](./img/OrcFileLayout.png)
 
 # File Tail
 
@@ -200,7 +200,7 @@ All of the rows in an ORC file must have the same schema. Logically
 the schema is expressed as a tree as in the figure below, where
 the compound types have subcolumns under them.
 
-![ORC column structure](/img/TreeWriters.png)
+![ORC column structure](./img/TreeWriters.png)
 
 The equivalent Hive DDL would be:
 
@@ -619,7 +619,7 @@ for a chunk that compressed to 100,000 bytes would be [0x40, 0x0d,
 that as long as a decompressor starts at the top of a header, it can
 start decompressing without the previous bytes.
 
-![compression streams](/img/CompressionStream.png)
+![compression streams](./img/CompressionStream.png)
 
 The default compression chunk size is 256K, but writers can choose
 their own value. Larger chunks lead to better compression, but require
@@ -796,7 +796,7 @@ length of 4 (3) as [0x5e, 0x03, 0x5c, 0xa1, 0xab, 0x1e, 0xde, 0xad,
 > Note: the run length(4) is one-off. We can get 4 by adding 1 to 3
 (See [Hive-4123](https://github.com/apache/hive/commit/69deabeaac020ba60b0f2156579f53e9fe46157a#diff-c00fea1863eaf0d6f047535e874274199020ffed3eb00deb897f513aa86f6b59R232-R236))
 
-![Direct](/img/Direct.png)
+![Direct](./img/Direct.png)
 
 ### Patched Base
 
@@ -1334,4 +1334,4 @@ Bloom filter streams are interlaced with row group indexes. This placement
 makes it convenient to read the bloom filter stream and row index stream
 together in single read operation.
 
-![bloom filter](/img/BloomFilter.png)
+![bloom filter](./img/BloomFilter.png)

specification/ORCv2.md

@@ -47,7 +47,7 @@ include the minimum and maximum values for each column in each set of
 file reader can skip entire sets of rows that aren't important for
 this query.
 
-![ORC file structure](/img/OrcFileLayout.png)
+![ORC file structure](./img/OrcFileLayout.png)
 
 # File Tail
 
@@ -220,7 +220,7 @@ All of the rows in an ORC file must have the same schema. Logically
 the schema is expressed as a tree as in the figure below, where
 the compound types have subcolumns under them.
 
-![ORC column structure](/img/TreeWriters.png)
+![ORC column structure](./img/TreeWriters.png)
 
 The equivalent Hive DDL would be:
 
@@ -638,7 +638,7 @@ for a chunk that compressed to 100,000 bytes would be [0x40, 0x0d,
 that as long as a decompressor starts at the top of a header, it can
 start decompressing without the previous bytes.
 
-![compression streams](/img/CompressionStream.png)
+![compression streams](./img/CompressionStream.png)
 
 The default compression chunk size is 256K, but writers can choose
 their own value. Larger chunks lead to better compression, but require
@@ -815,7 +815,7 @@ length of 4 (3) as [0x5e, 0x03, 0x5c, 0xa1, 0xab, 0x1e, 0xde, 0xad,
 > Note: the run length(4) is one-off. We can get 4 by adding 1 to 3
 (See [Hive-4123](https://github.com/apache/hive/commit/69deabeaac020ba60b0f2156579f53e9fe46157a#diff-c00fea1863eaf0d6f047535e874274199020ffed3eb00deb897f513aa86f6b59R232-R236))
 
-![Direct](/img/Direct.png)
+![Direct](./img/Direct.png)
 
 ### Patched Base
 
@@ -1350,4 +1350,4 @@ Bloom filter streams are interlaced with row group indexes. This placement
 makes it convenient to read the bloom filter stream and row index stream
 together in single read operation.
 
-![bloom filter](/img/BloomFilter.png)
+![bloom filter](./img/BloomFilter.png)